New species of Orthocentrinae (Hymenoptera: Ichneumonidae) from Finland

2008·0.39 MB·

by  Andrei Humala

©EntomologicaFennica.13June2008
New species of Orthocentrinae
(Hymenoptera: Ichneumonidae) from Finland
AndreiE.Humala
Humala, A. E. 2008: New species of Orthocentrinae (Hymenoptera: Ichneu-
monidae)fromFinland.—Entomol.Fennica19:94–104.
FivenewspeciesofichneumonidsofthesubfamilyOrthocentrinaes.l.weredis-
covered in Finnish collections. Anew genus is proposed for one new species
fromSouthernFinland,Fennomacruskoponenigen.etsp.n.Itsrelationshipsand
systematicpositionarebrieflydiscussed.Fourothernewspecies,Plectiscidea
aquilonia sp. n., P. fuscifemur sp. n., P. helleni sp. n. and Eusterinx (Holome-
ristus)fennoscandicasp.n.,fromFennoscandiaarealsodescribed.Thehitherto
unknownfemaleofHelictesfabularisRossemisdescribedaswell.
A.E.Humala,ForestResearchInstitute,KarelianCentreoftheRussianAcad-
emy of Sciences. Pushkinskaya St. 11, Petrozavodsk 185910, Russia; E-mail:
[email protected]
Received14June2006,accepted30July2007
1.Introduction H.Townes,basedonthefactthatthetypespe-
cies of the type genus (Plectiscus impurator
ThesubfamilyMicroleptinaesensuTownes(Hy- Gravenhorst, 1829) belongs to Orthocentrinae,
menoptera: Ichneumonidae) was established as proposed a new name for this group – Micro-
an independent taxon roughly equivalent to its leptinae(Townes1958).Heplacedtogetherwith
modern usage by A. Förster under the name plectiscines several genera of unclear relation-
Plectiscoidae (Förster 1869). He described the ships,admittingthatthissubfamilywasa“waste-
majorityofrecentgeneraandalotofspecies,re- basket group” (Townes 1971). Although some
vealingtheirsignificantmorphologicaldiversity genera, such as Oxytorus, Tatogaster, Acaeni-
(Förster1869,1871).Someichneumonidssimi- tellusandMicroleptes,werelaterexcludedfrom
lartoplectiscinesbelongingtoothersubfamilies, the group (and in this connection the subfamily
e.g.Ateleute,Polyaulon,Symphylus(=Acrodac- name has changed 3 times during the last 20
tyla),Adelognathus,wereincludedbyhiminthis years), up to now a uniform and generally ac-
group as well. On the other hand, many genera cepted classification is missing, and the sub-
withoutaclosedareoletintheforewing,which family still remains insufficiently known, be-
are included nowadays in Orthocentrinae, were cause of its high morphological diversity and
described by Förster in other groups of ichneu- confusingtaxonomy.
monids.C.G.Thomsonconsideredplectiscines After several genera were removed, the re-
among other Tryphonidae close to ortho- maining ones were treated as the subfamily
centrines, and divided them into 4 sections Helictinae (Gupta 1987, Gauld 1991, Dasch
(Thomson 1888). He synonymised some of 1992).ResultingfromtheworksofWahl(1986,
Förster’sgeneraandchangedtheirstatustosub- 1990), they were united with the orthocentrines
generaforsomeothers. within Orthocentrinae s. l. (Yu & Horstmann
ENTOMOL.FENNICAVol.19 (cid:127) NewspeciesofOrthocentrinaefromFinland 95
1997,Wahl&Gauld1998),whileCylloceriaand Some collections of the Zoological Museum of
Allomacrus were removed from other “helic- UppsalaUniversity (UUZM) havebeenrevised
tines”intothesubfamilyCylloceriinae.ThePa- aswell.Morphologicalterminology mainly fol-
laearctic fauna of these two segregated genera lows Gauld (1991). Finnish collecting localities
was recently revised (Humala 2002), and two are provided with coordinates using 27°E grid,
species, Cylloceria tenuicornis Humala, 2002 biogeographicalprovincesofEastFennoscandia
andAllomacrussubtilisHumala,2002,werede- are given according to Heikinheimo and Raati-
scribedfromFinlandandRussia.Thethirdgenus kainen(1971).
Rossemia(=Sweaterella)includedinthisgroup
wasdescribedfromtheKarelianRepublicandthe
FarEast(Humala1997,Wahl&Gauld1998). 3.Resultsanddiscussion
AccordingtotheCatalogueofWorldIchneu-
monidae (Yu & Horstmann 1997) the Ortho- 3.1.GenusFennomacrusgen.n.
centrinae s. l. comprises 31 recent genera, with
moderate numbers of species, though the struc- Diagnosis. Fennomacrus can be distinguished
tureandcompositionofthesubfamilyarestillfar fromallotherichneumonidgenerabythefollow-
from stable. Since that time the genus Kentro- ing combination of features: the wide and flat
tryphon was synonymised under Allomacrus clypeus (Fig. 1b); mandibles not twisted, with
(Schwarz 2004), genus Epitropus under Adelo- subequal teeth; weak notauli; absence of ste-
gnathus,PantomimaunderAcrodactyla,Fetialis rnauli; first sternite not fused with tergite, with
under Aclastus (Broad 2004) and the genus spiraclesbeforemid-lengthofsegment;compar-
CressoniawastransferredtoDiacritinae(Wahl& atively short, straight ovipositor; slender legs;
Gauld1998). presence of areolet; fore wing vein 2m-cu with
Allspeciesforwhichthebiologyisknownare twobullae;unbrokenreclivousnervellus;distinct
larval koinobiont endoparasitoids of Diptera sculptureofheadandmesosoma.Inthestructure
Nematocera, primarily fungus gnats (Sciaroi- ofthefirstmetasomalsegmentthenewgenusis
dea). Orthocentrines comprise a common and close to the representatives of tribe Cylloceriini
conspicuouspartoftheichneumonidfauna,espe- Wahl,1990(Humala2003,2007).Fennomacrus
ciallyinnorthandtemperateregions,wherethe differsfromAllomacrusintheweaknotauliand
group is particularly species-rich and abundant, straightovipositor;fromEntypomabytheweak
but up to now this subfamily is one of the least notauli,straightmandibles,slendererlegs,espe-
knownwithinIchneumonidae. cially femora, straight ovipositor; from Proeli-
atorandPlectiscideabythefirstmetasomalseg-
mentwithtergiteandsternitenotfused,presence
2.Materialsandmethods ofglymmaeonthefirsttergite,distinctgranulate
sculptureonheadandmesosoma.
For the present research the collections of Fennomacrus is represented by a single
Orthocentrinaes.l.storedattheZoologicalMu- knownspecies.Thehabitusofthegenusisillus-
seum, Finnish Museum of Natural History of tratedinFig.1a.
Helsinki University, including the collection of To my mind, the genus Allomacrus is much
WolterHellén(ZMHU),andDepartmentofAp- closertoApoclimaandEntypomathantoCyllo-
plied Biology of the Helsinki University ceria (Humala 2003), and D. Wahl’s arguments
(DABHU)–nowpartofZMHU–werestudied. forsegregationofthesetwogenera(Wahl1986,
Additionalmaterialcollectedduringentomologi- 1990) seems not to be convincing, which was
calinvestigationsintheBiosphereNaturereserve confirmed for instance by the synonymy of
“Northern Karelia” in 1994–1999 and in some AllomacrusandKentrotryphon(Schwarz2004).
adjacent territories, stored at the Karelian Re- So this group should be expanded by including
searchCentreinPetrozavodsk(KRC)andatthe other genera, based on the structure of the first
ZoologicalInstituteofRussianAcademyofSci- segment of the metasoma. According to Broad
ences, St. Petersburg (ZIN), were also used. (2004,pers.com.),Hyperacmushasacloserela-
96 Humala (cid:127) ENTOMOL.FENNICAVol.19
Fig.1.Fennomacrus
koponenigen.etsp.n.,
holotypefemale.
–a.Wholeinsect,lat-
eralview.–b.Head,
frontalview.–c.Head,
dorsalview.Scalebar
0.5mm.
tionshipwithOrthocentrinae+Cylloceriinaeand Etymology. The name is combined from
should not be separated from this group. Indi- Fenno–Fenniaandmacrus–fromrelatedgenera
rectlythiswasconfirmedby(cid:1)ediv(cid:2)and(cid:1)ev(cid:3)ík AllomacrusandStenomacrus.
(2003),whorearedH.crassicornisGravenhorst
fromthefungusgnatSciophilavaria(Winnertz), 3.1.1.Fennomacruskoponenisp.n.(Fig.1)
inhabiting the fruit body of Hydnum repandum
L.: Fr. (Cantharellales, Hydnaceae). As a result Typematerial.Holotype$,Finland,Sa:Ristiina
the new genus is placed together with genera 6826: 502; 4.VII.1980 (M. Koponen leg.)
Cylloceria,Hyperacmus,Allomacrus,Rossemia, DABHU.
Apoclima and Entypoma, forming the tribe Female(holotype).Bodylength2.9mm;fore
CylloceriiniWahl,1990withinsubfamilyOrtho- wing3.0mm;antennaslender,21flagellarseg-
centrinae. ments; first flagellar segment 5.0× as long as
ENTOMOL.FENNICAVol.19 (cid:127) NewspeciesofOrthocentrinaefromFinland 97
wide; secondflagellar segment 3.6× as long as after Martti Koponen, who collected the only
wide.Headwidth1.1×height;facewidthl.72× knownspecimenofthegenus.
height,0.57×headwidth,matt,punctate,lateral
marginsparallel;malarspace1.2×basalwidthof
mandible,withstripofrougher,granulatesculp- 3.2.GenusPlectiscideaViereck,1914
turebetweeneyeandmandible,subocularsulcus
absent; mandibles not twisted, teeth subequal; UnfortunatelytheexistingkeytofemalesofPa-
clypeussmallandwide,width2.4×height(Fig. laearctic Plectiscidea species (Rossem 1991) is
1b),slightlyconvexatbase,remainderflattened almostofnopracticaluse,asveryfewcharacters
to apex, transversely weakly convex; anterior (mainly theratiooflengthoffirstflagellar seg-
tentorialpitssmall;fronsmatt;ocular-ocellardis- ment to its apical width, ratio of length of first
tance (OOL) about 1.6× post-ocellar distance metasomalsegmenttoitsapicalwidthandratioof
(POL),1.9×greatestdiameteroflateralocellus; ovipositorlengthtoforewinglength)wereused
gena well developed, strongly convex, matt, inthekey,anditisnotenoughforreliablespecies
width 3.0× greatest diameter of lateral ocellus divisionandrecognition.Moreoverthiskey,in-
(Fig.1c);occiputslightlyconcave,occipitalca- cluding newly described species, is not illus-
rinacomplete. trated.
Mesosoma length 1.65× height, evenly matt
exceptpolishedonspeculum;shortepomiapres- 3.2.1.Plectiscideaaquiloniasp.n.(Figs2a–b)
ent; mesoscutumpunctate, notaulus slightly de-
veloped anteriorly, obsolete; epicnemial carina Diagnosis.UsingvanRossem’skeytothegenus
complete; sternaulus absent; propodeum cori- Plectiscidea(Rossem1991),thisspecieskeysto
aceous,carinaecompleteexceptlackingcostulae P.nemorensisRossem,resemblingitinitsshort
andanteriorportionsofmedianandlaterallongi- ovipositor and in the shape of the first flagellar
tudinal carinae; propodeal spiracles small. segment, but differs in having distinct notaulus
Nervulusnearlyinterstitial,almostoppositebasal withweak,short,verticalcarinabasallyoninner
vein; subdiscoideus arising at basal 0.7 ofpost- side,absenceofareoletinforewing,slenderhind
nervulus; areolet large, petiolate; second recur- femur, more slender first metasomal segment,
rent vein 2m-cu with two bullae; nervellus fuscousclypeusandtergites2–3.
reclivous, not intercepted, discoidella lacking.
Legsslender;hindfemurlength5.2×height;hind The new species should be inserted in the van
basitarsus0.41×lengthofhindtibia. Rossem’skeyasfollows:
First metasomal segment 1.65× as long as
wide apically, granulate, sternite not fused with 3. Ovipositorshort,0.09–0.10oflengthoffront
tergite,reaching0.36ofsegmentlength,spiracles wing, basal flagellomeres with more or less
0.4 of segment length; median dorsal carinae distinctmedialnotch,thusgivingimpression
weak; dorsolateral carinae present; glymmae oftwoshortinflatedsegments. 4
present; postpetiole length 0.87× width; second – Ovipositornotshorterthan0.14oflengthof
metasomal segment 0.85× as long as wide api- frontwing. 5
cally, granulate; laterotergites separated by a 4. Areolet closed; notauli not developed. Hind
crease; remaining tergites nearly polished, femur not so slender. Postanellus long, 6.0
slightly depressed at apex; ovipositor short and times its apical width. First metasomal seg-
straight,somewhatcompressed,itssheathrather ment 2.3 times as long as its apical width.
wide,0.53×lengthofhindtibia. Clypeus,apicalpartoftergite2andtergite3
Colouration.Fuscous,dusky-rufousonman- mediallylightbrown.Forewing3.0–4.1mm.
diblesandlegs.Dusky-tawnyonpalpi,clypeus, nemorensisRossem
tegulaeandwingbases.Wingshyaline. – Areoletopen(vein3rs-mabsent);notaulievi-
Male.Unknown. dent,withweakshortverticalcarinabasally
Biology.Notknown. from its inner side. Hind femur slender, 7.3
Etymology.Iampleasedtonamethisspecies timesitsheight.Postanellus5.4timesitsapi-
98 Humala (cid:127) ENTOMOL.FENNICAVol.19
Fig.2.Bodypartsof
Plectiscidea.–a.P.
aquiloniasp.n.,holo-
typefemale.Head,dor-
salview.–b.P.aqui-
loniasp.n.,holotypefe-
male.Hindfemurand
tibia.–c.P.fuscifemur
sp.n.,holotypefemale.
Head,dorsalview.–d.
P.fuscifemursp.n.,
holotypefemale.Basal
metasomalsegments,
dorsalview.–e.P.hel-
lenisp.n.,holotype
male.Firstmetasomal
segment,dorsalview.
–f.P.hellenisp.n.,
holotypemale.Meso-
soma,lateralview.
Scalebars0.5mm.
calwidth.Firstmetasomalsegment2.6times lake 10.IX.1970 (D. Kasparyan leg.), Sakhalin,
as long as its apical width. Clypeus and ter- Aniva 11.VII.1981, 13.VII.1981 (S. Beloko-
gitesfuscous.Forewing3.0mm. bylskii leg.) ZIN, Karelia Kon: Nature reserve
aquiloniasp.n. Kivach 16–19.VIII.1991 (Malaise trap, A.
Humalaleg.)KRC;Finland,Ab:Turku,Ruissalo
Averticalcarinaontheinnersideofthenotaulus 6712: 234, 18.IX.1981 (M. Koponen leg.)
occursinfrequentlyinafeworthocentrinegenera DABHU.
(e.g. Plectiscidea, Symplecis, etc.), though as a Female(holotype).Bodylength2.9mm.Fore
ruleitisnotsowelldevelopedasinAniseresspe- wing 3.0 mm. Antennae with 16 flagellar seg-
cies. ments, first flagellar segment 5.4× as long as
wide, basal segments seeming to be subdivided
Type material. Holotype $ Russia, Khabarovsk by medial notch. Face width 0.49× head width,
Terr., Udyl’lake9.IX.1970(D. Kasparyanleg.) lateral margins subparallel. Clypeus convex,
ZIN; 5 $$ paratypes: Khabarovsk Terr., Udyl’ truncated apically, anterior tentorial pits small.
ENTOMOL.FENNICAVol.19 (cid:127) NewspeciesofOrthocentrinaefromFinland 99
Malarspacewide,2.3×widthofmandible,0.42× parativelyshort,slightlyupcurvedovipositorand
face width; lacking subocular sulcus or band of darkhindfemora.
coriaceoussculpturebetweeneyeandmandible. Typematerial.Holotype$,Finland,N:Hel-
Mandible slender, lower tooth slightly shorter sinki, Kannelmäki 6682: 382, 16.IX.1978 (M.
than upper tooth; ocular-ocellar length (OOL) Koponenleg.);2$$paratypes,Ab:Vihti,Siika-
about 1.3× greatest diameter of lateral ocellus, järvi(val.),24.IX–1.X.1971(A.Petramaaleg.),
1.25× postocellar length (POL). Gena convex, N: Nurmijärvi, Murhamäki 6710: 381, 23.IX.
width 3.3× greatest diameter of lateral ocellus; 1993 (M. Koponen leg.) DABHU; paratype #,
occipitalcarinacomplete(Fig.2a). Russian Karelia Kon: 5 km S Medvezh’jegorsk
Mesosoma 1.49× as long as high. Epomia 7.VI.2000(A.Humalaleg.)ZIN.
well developed, not reaching upper margin of Female(holotype).Bodylength4.6(4.5–4.7)
pronotum.Notaulusdevelopedonanteriorendof mm.Forewing4.5(4.4–4.5)mm.Antennaelong,
mesoscutum,withweakshortverticalcarinaba- 19 (20 in paratype) flagellar segments; first
sallyfromitsinnerside.Epicnemialcarinacom- flagellar segment 6.9× as long as wide, second
plete. Scutellum slightly convex, lateral carinae 6.0× as long as wide. Clypeus slightly convex,
to near apex; sternaulus short; propodeum clypeal foveae small. Face width 0.48× head
weaklydeveloped,carinaecompleteexceptlack- width,lateralmarginsparallel.Malarspace0.33×
inganteriortransversecarina,propodealspiracle facewidth,about1.45×basalwidthofmandible;
small.Areoletnotclosed;secondrecurrentvein lackingsubocularsulcusbetweeneyeandmandi-
2m-cu with two bullae; nervulus opposite basal ble, but strip of coriaceous sculpture present.
vein; nervellus not intercepted, vertical, discoi- Mandible slender, tapered, lower tooth slightly
dellaundeveloped.Legsslender,hindcoxapol- shorter than upper tooth; ocular-ocellar length
ished,hindfemur7.3×aslongashigh,hindtibia (OOL) about 1.2× post-ocellar length (POL),
constricted in basal third, the rest somewhat in- 1.4× greatest diameter of lateral ocellus; gena
flated (Fig. 2b); hind basitarsus 0.40× length of convex, width 2.9× greatest diameter of lateral
hindtibia.Propodeum,legsandfirstmetasomal ocellus, head behind eyes strongly narrowed
segmentcoveredwithlongerecthairs. (Fig.2c);occipitalcarinacomplete.
Firstmetasomalsegmentcoriaceous,2.6×as Mesosoma 1.61× as long as high. Epomia
long as wide apically, dorsal and dorsolateral strong, reaching upper side of pronotum.
carinae developed in basal 0.3 of segment, its Notaulusshallow,weaklydevelopedonanterior
sternitecoveringbasal0.5,spiraclesat0.4ofseg- endofmesoscutum.Sternaulusshort,butwellde-
ment length; glymma lacking, second tergite veloped. Epicnemial carina not interrupted, not
0.75×aslongaswideapically,polished;remain- reaching anterior margin of mesopleuron. Scu-
ing tergites polished. Ovipositor very short, tellum slightly convex, lateral carinae to near
0.32×hindtibia,about0.1×forewinglength(in apex. Propodeum coriaceous, carinae complete
paratypeovipositorhardlyprojectingbeyondde- exceptlackinganteriortransversecarina,propo-
pressedapexofmetasoma,itslength0.25×hind dealspiraclessmall.Areoletpetiolate,compara-
tibia). tivelylarge;nervulusoppositebasalvein;second
Colouration. Fuscous, palpi, mandibles and recurrent vein 2m-cu with two bullae; nervellus
legs brownish-yellow; face, clypeus, scapi, indistinctly intercepted below the middle,
tegulae, hind coxae and tarsi brownish. Wings discoidella not pigmented. Legs slender, hind
hyaline,pterostigmalight-brown.Thereisnosig- coxacoriaceous;hindfemur6.7×aslongashigh;
nificantvariationintheexaminedspecimens. hindbasitarsus0.46×lengthofhindtibia.
Male.Unknown. First metasomal segment long and slender,
2.6× as long as wide apically, coriaceous (Fig.
3.2.2.Plectiscideafuscifemursp.n.(Figs2c–d) 2d); carinae undeveloped, glymmae lacking;
sternite at 0.53, spiracles at 0.36 of segment
Diagnosis.Thenewspeciescanbedistinguished length; second tergite as long as wide apically,
from other representatives of the genus by the basalpartofsegmentcoriaceousmedially,thyri-
longandslenderfirstmetasomalsegment,com- diaabsent;laterotergitenotseparatedbyacrease,
100 Humala (cid:127) ENTOMOL.FENNICAVol.19
spiraclesoftergites2and3onlaterotergites;re- flagellar segment length 3.6× width, elevated
maining tergites polished. Metasoma slightly tyloidsonsegments5–7offlagellum.Headpol-
compressed at apex; ovipositor short, 0.44× ished with sparse hairs. Face width 0.56× head
lengthofhindtibia,0.13×forewing,apicalpart width;genaconvex,width2.5×greatestdiameter
slightlyupcurved. oflateralocellus;occipitalcarinacomplete;ocu-
Colouration.Fuscous,mandibles,palpi,scapi lar-ocellar length (OOL) as long as post-ocellar
ventrally, tegulae, fore and middle legs, hind length (POL), 1.4× greatest diameter of lateral
coxae apically, trochanters of hind legs, apical ocellus.Clypeusconvex;lackingsubocularsul-
third of second tergite and third tergite yellow. cus between eye and mandible, but a strip of
Antennaedarkbrown.Baseofhindcoxae,hind coriaceoussculpturepresent.Malarspaceabout
femora,apicalhalfofhindtibiaeandtarsibrown. 1.3×basalwidthofmandible;tipofmandiblesin-
Wingshyaline.Thereisnosignificantvariation visiblebecauseofinconvenientmounting.
intheexaminedspecimens. Mesosoma 1.47× as long as high. Epomia
Male. Body length 4.3 mm. Fore wing 4.1 strong, reaching upper side of pronotum. Scu-
mm; antennae in only known specimen broken tellum with lateral carinae not reaching apex.
after third flagellomere; first flagellar segment Notaulus present. Central part of mesoscutum
5.7×aslongaswide,secondflagellarsegmentas polished,coveredwithsparsehairs,middlesur-
longasfirst.Clypeusconvex.Facewidth0.45× faces of propleuron and mesopleuron polished,
head width, lateral margins subparallel. Malar hairless.Sternaulusshort;propodeumofalmost
space0.31×facewidth,about1.5×basalwidthof cubic shape (Fig. 2f), carinae complete except
mandible;OOLabout1.2×POL,1.2×greatestdi- lackinganteriortransversecarina,propodealspi-
ameteroflateralocellus;genaconvex,width2.7× racle small. Areolet present, second recurrent
greatest diameter of lateral ocellus. Mesosoma vein 2m-cu with two bullae; nervulus opposite
1.48×aslongashigh.Legsslender,hindfemur basalvein;nervellusindistinctlyinterceptedbe-
6.8×aslongashigh;hindbasitarsus0.41×length lowthemiddle,discoidellanotpigmented.Legs
ofhindtibia.Firstmetasomalsegmentlongand ofmoderatesize;hindfemurlength6.1×height.
slender,2.8×aslongaswideapically,coriaceous; First segment of metasoma 2.6× as long as
sternite at 0.46, spiracles at 0.38 of segment wideapically,itssterniteat0.41,spiraclesat0.36
length; second tergite 1.2× as long as wide api- itslength;glymmaelacking;weakcarinaedevel-
cally,basalpartofsegmentcoriaceousmedially; opedinbasalthirdofsegment.Postpetiolesome-
remainingtergitespolished.Othercharactersand what striated and compressed dorso-ventrally.
colourationasinfemale. Spiracles of first metasomal segment strongly
protruding,thewidthofsegmentatspiracles1.2×
3.2.3.Plectiscideahellenisp.n.(Figs2e–f). itsapicalwidth(Fig.2e).Secondtergitepolished,
thyridia small, remaining tergites polished.
Diagnosis.Thespeciesisrecognizablebyitsun- Propodeum and metasoma covered with long,
usually cubic propodeum and the strongly pro- sub-erecthairs.
trudingspiraclesofthefirstmetasomalsegment. Colouration.Fuscous,clypeus,palpi,mandi-
Type material. Holotype #, Finland, Le: bles,tegulae,legsincludingcoxae,apicalthirdof
Enontekiö, Kilpisjärvi, Siilastupa 11.VII.1950 tergite2andbasalhalfoftergite3yellow.Anten-
(W.Hellénleg.)ZMHU. nae yellowish, fuscous dorsally. Wings hyaline,
Male (holotype). Body length 4.2 mm. Fore pterostigmalightbrown.
wing4.0mm.Scapuslarge,ovoid,itstruncation Female.Unknown.
with rounded incision. Antennae consist of 21 Etymology.Thisspeciesisnamedinhonour
comparatively stout flagellar segments, first ofthecollector,WolterHellén–afamousFinnish
flagellar segment 3.8× as long as wide, second specialistinIchneumonidae.
ENTOMOL.FENNICAVol.19 (cid:127) NewspeciesofOrthocentrinaefromFinland 101
3.3.GenusEusterinxFörster,1869
SubgenusHolomeristusFörster,1869
3.3.1.Eusterinx(Holomeristus)
fennoscandicasp.n.(Fig.3)
Diagnosis. From the closely allied E. (Holo-
meristus)aquilonigenaRossemthenewspecies Fig.3.Eusterinx(Holomeristus)fennoscandicasp.n.,
differsinitsinflatedgenaeandlongnotaulimeet- holotypemale.–a.Rightmandible.–b.Head,dorsal
ing in the centre of the mesoscutum. From view.–c.Propodeum,dorsalview.Scalebars0.1mm
ProeliatorpropriusRossemitdiffersinstrongly (a)and0.5mm(b,c).
twistedmandibles,theshapeofclypeus,thenum-
beroftyloidsandthepresenceofcostulae.
Type material. Holotype # Finland, N: parallel-sided (Fig. 3c). Fore wing with large
Nurmijärvi, Röykkä hospital 6712: 370, 6.IX. areolet, second recurrent vein 2m-cu with two
1986 (M. Koponen leg.) DABHU; paratype # bullae;nervulusinclivous,slightlydistalofbasal
with the same data; paratype $ N: Orimattila, vein;nervellusreclivous,notintercepted.Legsof
6754: 419, 21.IX.1980 (M. Koponen leg.) moderate size; hind femur length 5.7× height;
DABHU; paratype $ Sweden, Upl: Uppsala, hindbasitarsus0.37×lengthofhindtibia.
Starbo7.X.1979(M.Idarleg.)UUZM. First segment of metasoma 2.5× as long as
Male(holotype).Body length3.0(3.1)mm. wideapically,sterniteat0.6,spiraclesat0.45its
Forewing3.1(3.2)mm.Scapuslarge,ovoid.Fla- length;sterniteandtergitefused,glymmaelack-
gellumconsistof23(24)segments,firstflagellar ing; median and lateral longitudinal carinae de-
segment 4.5× as long as wide, second flagellar veloped; postpetiole somewhat striated. Second
segmentlength3.8×width,tyloidsonflagellum metasomalsegmentlength0.87×aslongasapical
segments 6–8. Head polished with sparse hairs. width,thyridiaundeveloped,tergitesubpolished;
Face width 0.49× head width; head distinctly remainingtergitespolished.
widened behind the eyes level (Fig. 3b), genae Colouration. Fuscous, head almost black.
strongly convex, inflated, occipital carina com- Clypeus, palpi, mandibles, base of antennae,
plete; ocular-ocellar length (OOL) 2.0× posto- malar space, lower gena, propleuron, tegulae,
cellarlength(POL),1.7×greatestdiameteroflat- legsincludingcoxaeyellow.Faceandtherestof
eralocellus.Clypeuslarge,2.1×aswideaslong, antennae brownish. Wings hyaline, pterostigma
convexbasally,remainingpartslightlyconcave, lightbrown.
itsapicalmargintransparent,coveredwithlong Female.Bodylength3.1mm.,forewing3.1
hairs;subocularstripofcoriaceoussculpturebe- mm. Flagellum consist of 23 segments, first
tween eye and mandible present. Malar space flagellar segment 4.8× as long as wide. Ovi-
narrow, about 0.3× basal width of mandible, positorstraight,itslength0.95×hindtibialength
0.20× face width. Mandibles wide basally, or0.25×forewing.Othercharactersandcoloura-
strongly twisted inwards, lower tooth small, in- tionasinmale.
visibleinfrontalview;upperedgesharplydelim-
ited from frontal surface of mandibles, lower TentativekeytothePalaearcticspeciesofsubge-
edgeborderedwithtransparentlamella(Fig.3a). nusHolomeristusFörster:
Mesosoma 1.50× as long as high. Epomia
present,reachinguppersideofpronotum.Notauli 1. Posterior transverse carinae of propodeum
well developed, meeting in the centre of meso- formingweakapophyses. Malarspacelong,
scutum. Scutellar lateral carinae absent. Epic- about 0.4× face width. Hind femur inflated,
nemialcarinacomplete;sternaulusshort;propo- 5.5× as long as high. [Clypeus convex.
deumwithallcarinaedeveloped,areapetiolaris Flagellum of $ with 18 segments, 1st
comparatively small, narrow; area superomedia flagellomere3.3×aslongasapicalwidth;#
102 Humala (cid:127) ENTOMOL.FENNICAVol.19
tyloids on flagellomeres 6–7. Tergite 2 of lengthor0.25×forewing.Bodylength3.0–
metasoma coriaceous. Ovipositor upcurved, 3.1mm.,forewing3.1–3.2mm.
0.23–0.25×forewinglength.Bodylength4.1 fennoscandicasp.n.
mm.,forewing3.3–3.8mm]. – Head not so widened behind the eyes.
refractariaRossem Clypeusnotsolarge,mostlyflattened.Man-
– Propodeumwithoutapophyses.Malarspace diblesnotsowidebasally,withouttransparent
shorter, 0.18–0.30× face width. Hind femur lamella on lower edge. Malar space 0.23–
notinflated 2 0.25×facewidth.Flagellum$consistsof16
2. Notaulinotreachingcentreofmesoscutum. 3 segments,1stflagellomere3.0–5.0timeslon-
– Notauliwelldeveloped,meetingincentreof ger its apical diameter, apical flagellomere
mesoscutum. Malar space 0.20–0.25× face clavate; # 18–19(20) segments, tyloids on
width. 4 flagellomeres 6–7(8)(9). Rear of lower
3. Malar space short, 0.18× face width. mesopleuron with narrow strip of longitudi-
Flagellum of $ with 20–21 segments, 1st nal striae. Area superomedia of propodeum
flagellomere slender, 4.5× as long as apical elongate,narrowedposteriorly,costulaewell
width, # with 21–24 segments, tyloids on developed. Metasomalsegments2andmost
flagellomeres 6–9(10)(11). Inner orbits of 3 coriaceous, longitudinally striate. Ovi-
subparallel. Area superomedia not longer positordistinctlyupcurved,0.20–0.29offore
thanwidth,costulaemoreorlessdeveloped, wing length. Pronotum and metasomal seg-
apicalarealong.Tergite1coriaceous,2.3×as ments2–3,atleastapically,oftenyellow,hind
long as apical width; tergite 2 of metasoma coxaeandfemorafuscous.Bodylength3.9–
basally with longitudinal striae, apical part 4.1mm,forewing3.1–3.8mm.
polished. Ovipositor 0.14–0.19× fore wing tenuicinctaFörster
length.Forewing3.1mm.
aquilonigenaRossem
– Malarspace0.28×facewidthonthelevelof 3.4.GenusHelictesHaliday,1837
antennae, 1.4× basal width of mandible.
Flagellumwith20segments,1stflagellomere 3.4.1.HelictesfabularisRossem,1987(Fig.4)
4.6× as long as apical width, tyloids absent.
Inner orbits weakly converging downwards. Material. 7 $$ were found together with ##
Area superomedia elongate, costulae weak. from Russia, Karelia, Kon: Kivach Nature Re-
Tergite 1 polished, 2.7× as long as apical serve,birchandmixedforests,6–9.IX.1991,13–
width;tergite2withfinelongitudinalstriae. 16.IX.1991,20–24.IX.1991,27–30.IX.1991,2–
Body length 3.4 mm., fore wing 3.0 mm. 9.X.1990, 11–15.X.1991 (Malaise traps, A.
simplicornisHumala($unknown) Humalaleg.)KRC.
4. Headdistinctlywidenedbehindtheeyes(Fig. Female.Bodylength4.5–5.8mm,forewing
3b),genaestronglyconvex,inflated.Clypeus 4.5–5.8 mm; antennae slightly longer than in
large, 2.1× as wide as long, convex basally, male, 25–28 flagellomeres: first flagellar seg-
remaining part slightly concave, apical mar- ment7.0×aslongaswide,secondflagellarseg-
gin transparent. Mandibles wide basally, mentlength3.6×width;middlesegmentsnearly
strongly twisted inwards; lower edge bor- 2.0x, subapical flagellomeres 1.5× as long as
dered with transparent lamella (Fig. 3a). wide;scapiinflated,obliquelytruncatedforming
Malar space narrow, 0.20× face width. angleofabout45°;headwidth1.05×height;face
flagellumconsistsof23–24segments,tyloids convex,width0.60×headwidth,clypeusconvex,
on # flagellomeres 6–8. Mesopleuron with- apical margin truncate; anterior tentorial pits of
out longitudinal striae. Area superomedia moderatesize,open;malarspacelong,2.5×basal
parallel-sided (Fig. 3c). Tergite 2 of meta- widthofmandible,withgranularsubocularstrip;
somasubpolished.Pronotumandmetasomal mandiblesstronglytapered,twistedinwards,up-
tergites fuscous. Legs, including coxae yel- pertoothlongerthanlowertooth;ocelliofmod-
low. Ovipositor straight, 0.95× hind tibia eratesize,OOLaslongas0.8×POL,POL2.2×as
ENTOMOL.FENNICAVol.19 (cid:127) NewspeciesofOrthocentrinaefromFinland 103
Acknowledgements.TheauthorisgratefultotheNordic
CouncilofMinistersandCentreforInternationalMobility
(CIMO)whosupportedthisresearchonFinnishcollec-
tionsin1996andin1998;toAndersAlbrecht(ZMHU),
Martti Koponen (DABHU) and Mattias Forshage
(UUZM)foraccesstocollections;toReijoJussilaforsub-
sequentaccesstohiscollection;tothestaffoftheZoologi-
calMuseumofHelsinkiUniversityandDepartmentofAp-
pliedBiologyofthesameUniversity.MarttiKoponenis
thankedforsupplyingwithexactinformationoncollecting
localitiesinFinland. IamalsomuchindebtedtoGavin
Broadforreviewingthemanuscript,valuablecomments
andimprovingtheEnglish.
Fig.4.HelictesfabularisRossem,female.–a.Head,
dorsalview.–b.Hindleg,lateralview.Scalebar0.5
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