Three new of the Nematinus acuminatus group (Hymenoptera : tenthredinidae) from Japan, with a key to species

8 Pages·1991·3 MB·

by  I Togashi

.
PROC. ENTOMOL. SOC. WASH.
93(3), 1991. pp. 652-659
THREE NEW SPECIES OF THE NEMATINUSACUMINATUS GROUP
(HYMENOPTERA: TENTHREDINIDAE) FROM JAPAN,
WITH A KEY TO SPECIES
ICHUI TOGASHI
Ishikawa Agricultural College, 1-308, Suematsu, Nonoichi-machi, Ishikawa Prefecture,
921 Japan.
Abstract.—T\iVQQ new species ofthe Nematinus acuminatus group from Japan are de-
scribed and illustrated, N. variabilis n. sp., N. shinoharai n. sp, and N. helvipes n. sp. A
key is provided for separation ofthe Japanese speciesgroups o{Nematinusand ofspecies
ofthe acuminatus group.
Key Words: sawflies, Nematinus, Japan
SevenspeciesofthegenusNematinushave - Abdominal tergites mostly reddish brown .... 6
been recorded fromJapan, A^. luteusPanzer, 4. Abdominal stemites mostly reddish brown . . 5
- Abdominal stemites black (head and thorax
N. japonicus (Marlatt), N. alni Rohwer, N.
blackwithfollowingpartsreddishyellow:clyp-
dorsalis (Matsumura), N. acuminatus eus, labrum, cheeks, temples, posteriorangles
(Thomson), N. rubrocaudatusTakeuchi, and ofpronotum, and tegula; last abdominal seg-
N. bensoni Tog2is\\\ (Takeuchi 1952, 1956, ment and sawsheath except for apex reddish
Togashi 1964a, b, 1966). The first four be- brown, apex ofsawsheath dark brown)
rubrocaudatusTakeuchi
long to the luteus group, and the last three
5. First to 8th abdominal tergites black; meso-
to the acuminatus group. Recently, 1 found notumwith4blackmaculae;upperfrons,ocel-
several specimens belonging to the acumi- lar basin, and post-ocellararea black
natus group that represent three new spe- bensoniTogashi
cies. I describe these species and give a key - Firstto6thabdominal tergitesblackwith red-
to the species of the A^. acuminatus group dbilsahckbmraocwunlalea;terhaeladsidweist;homuetsoblnaoctkummacwuiltahoeut
ofJapan. acuminatus(Thom.son)
6. Mesoscutellum mostlyreddish yellow(Figs. 3,
Key to the Japanese Species
and 12-14); stigma of forewing pale yellow;
Groups of Nematinus and OOLslightlylongerthan POL; hindbasitarsus
Species of the Acuminatus Group slightlylongerthan following3 segmentscom-
bined; lancet: Fig. 6 variabilis sp. nov.
1 Sawsheath broad, roundortruncateatapex in - Mesoscutellum entirely black (Figs. 34—36);
dorsal view /;//('//.f-group stigma offorewing dark brown; OOL slightly
- Sawsheath acuminate at apex in dorsal view shorter than POL; hind basitarsus slightly
(Figs. 4, 8, 10, 32, and 37) shorter than following 3 segments combined;
acuminatus-gxoux) 2
lancet: Fig. 39 shinoharai sp. nov.
2. Entirelyblackexceptforyellowtegulaandcer-
cus; legsyellow with coxae black
helvipes sp. nov. Nematinus variabilis Togashi,
- Head and thorax mostly reddish yellow, with New Species
blackmaculaeorsometimesunderthoraxblack; (Figs. 1-6, 12-19, and 21-24)
apicalportionofhindfemurortibiawithblack Female.—Length 9.5 mm. Body reddish
spots 3
3. Abdominal tergites mostly black 4 brown with following parts black: area sur-
VOLUME 93, NUMBER 3 653
Figs. 1-11. 1-6, Nematinus variabilis. 7-9, N. caledonicus. 10-11,A^. acuminatus. 1,dorsal view. 2, 7, head,
dorsal view. 3, thorax,dorsal view. 4, 8, 11, sawshealh, dorsal view. 5, 9, 11, sawsheath, lateral view. 6, lancet.
roundingfront ocellus, supraclypeal foveae, metascutellum, metanotum, upper half of
anterior portion of postocellar area, trian- mesepimeron, mesosternum, propodeum,
gular macula ofpraescutum, two large and anterior margin of 2nd to 5th abdominal
two small maculae on mesonotal lateral tergites, and sawsheath. Antenna reddish
lobes (Fig. 3), sunken areas, anterior and brown, with following parts dark brown:
posteriorportion ofmesoscutellum (Fig. 3), basal two segments and upper surfaces of
654 PROCEEDINGSOFTHE ENTOMOLOGICALSOCIETY OF WASHINGTON
^,7^
^,5^,6
Figs. 12-24. 12-19, 21-24, Nematinus variabilis. 20,N. acuminatus. 12-14, mesonotum. 15-20, mesopleu-
ron. 21-24, basal three abdominal segments.
3rd and 4th segments, but apical portion of OCL = 1.1-1.2:1.0:1.1-1.2; frontal area
4th segment becoming paler. Wings slightly slightly concave; median fovea deep and
yellowish hyaline; veins dark brown with elongate;lateralfoveaedeep,circularinout-
followingparts pale yellow: costa, subcosta, line, with a conical like projection in mid-
costal vein, submedius, stub of anal vein, dle; clypeus nearly flattened, anterior mar-
and stigma offorewing. Legs reddish yellow gin rather semicircularly emarginate; malar
but apical portion ofhind femur and tibia space broad, slightly longer than diameter
dark brown. offront ocellus.
Head: posterior area rectangular; inter- Antenna slightly shorter than costa plus
ocellarfurrowdistinctanddeep; postocellar stigma of forewing (ratio between them
furrow rather ill-defined; anterior halves of about 1.0:1.1); relative lengths ofsegments
lateral furrows deep and rather broad, but about 1.5:1.0:5.0:5.7:5.2:4.1:3.6:3.0:3.7.
posterior halves linear (Fig. 2); OOL:POL: Thorax: normal; mesoscutellum nearly
VOLUME 93, NUMBER 3 655
flattened; prepectus distinct but flattened. Nematinus shinoharai Togashi,
Abdomen: sawsheath as in Figs. 4 and 5; New Species
lancet as in Fig. 6. (Figs. 25-28, 32-36, and 39)
Punctation.—Head and thorax except for Female.—Length 9.5 mm. Head and tho-
prepectuscoveredwithfinesetigerouspunc- raxblackwith followingpartsreddish brown
tures; prepectusnearlyimpunctate, shining, toreddishyellow: hindorbits, lowerportion
Abdomin—al tergites shagreened. of inner orbits and malar space, clypeus,
Male. Unknown. labrum, mandibleexceptforapex, labialand
Distribution.—Japan (Hokkaido). maxillary palpi, latero-posterior comer of
Holotype: female, 13. VI. 1986, Hitsuji- pronotum, tegula, and two maculae on
gaoka, Sapporo, Hokkaido, I. Togashi leg. mesonotum (Fig. 34). Abdomen reddish
Paratypes: three females, 18. VI. 1984, brown but sawsheath black. Antenna red-
Yamada-onsen, Tokachi, Hokkaido; 2 fe- dish brown but basal two segments and up-
males, 21. VI. 1984, Shiretoko-toge, Aba- per surface of 3rd to 5th segments black.
shiri, Hokkaido; 3 females, 24. VI. 1984, Wings pale yellowish hyaline, costa dirty
Kogen-onsen, Mts. Taisetsu, Hokkaido; 1 yellow, stigma and veins except for basal
female, 11-12. VI. 1986, Futamata-onsen, halfofsubmedius and stub ofanal vein in
Oshima, Hokkaido. Allspecimenscollected forewing dark brown, basal halfofsubme-
by Dr. A. Shinohara.
diuspaleyellow. Legspaleyellowtoreddish
Holotype and 6 paratypes are deposited
yellow with following parts dark brown to
in National Science Museum (Nat. Hist.), black: basal % ofhind coxae, apical halfof
Tokyo. OneparatypeisdepositedintheNa-
tional Museum ofNatural History, Wash- hindfemur,andapicalportionofhindtibia.
ington, D.C., and one paratype in my col- Head: postocellar area nearly flattened;
lateral, interocellar, and postocellarfurrows
lection.
Remarks.—This new species closely re- distinct and deep (Fig. 26); distinct pits ad-
sembles Nematinus caledonicus (Cameron) jacent to anterior ocellus (Figs. 25 and 26);
of Europe, but it is easily separated from frontal area nearly flattened with distinct
the latter by the form ofthe sawsheath (in surrounding furrow except for lower por-
caledonicus, theapexofthesawsheathisnot tion, and with median groove (Fig. 25); me-
acute, compare Figs. 4 and 8), by the form dian fovea distinct, circular in outline; lat-
ofthe lateral furrows ofthe postocellararea eralfoveaedistinctanddeep;antenno-ocular
(in caledonicus, the anterior '/3 ofthe lateral distance nearly as long as distance between
furrows is deeply depressed but the poste- antennal sockets; malar space long, nearly
rior % is linear), by characters ofthe lancet, twice as long as diameter of front ocellus.
and by the maculation of the mesonotum Postorbital groove distinct (Fig. 26).
(in caledonicus, the mesonotum lacks black Thorax:normal; hindbasitarsusnearlyas
maculae). long as following 3 segments combined (ra-
Variation.—The triangular macula ofthe tiobetween them about 1.00:0.96)(Fig. 28);
mesopraescutumvariesfrom black(Fig. 12) ratio between length ofhind basitarsus and
to reddish yellow (Fig. 13), and the macu- inner hind tibial spur about 1.0:0.6 (Fig.
lationofmesonotallateral lobesvariesfrom
28).Abdomen:normal. Sawsheathasin Figs.
four distinct (Fig. 3) to two maculae (Figs.
t1h3eamnedso14s)t.eAmlusom, vtahreiebslafcrkommaacullaartgeio(nFiog.f 32Paunncdta33t;iolna.n—cetHewiatdh a1n2dsetrhruolraaex(Fciogv.e3r9e)d.
15) to small spot (Fig. 19), and the black of with medium-sized punctures, but frontal
the metanotum and the propodeum varies area, posterior half of mesonotal lateral
from mostly black to only small maculae lobes, mesoscutellum except for posterior
(Figs. 21-24). '/4, posttergite except for anterior portion,
PROCEEDINGS OFTHE ENTOMOLOGICALSOCIETY OFWASHINGTON
656
1 mm 1 mm
Figs. 25-31. 25-28. Nematinusshinoharai. 29-31, N. helvipes. 25, 29, head, frontview. 26, 30, head,dorsal
view. 27, mesopleuron. 28, 3L hind tarsus.
and metanotum covered with very fine Male.—Unknown.
punctures, shining; posterior 'A of meso- Distribution.-Japan (Hokkaido and
scutellum and anterior portion of postter- Honshu).
gite covered with rather large punctures; Holotype: female, 21. VII. 1981, Naka-
propodeumnearlyimpunctate,shining; 2nd noyu, near Mt. Ontake, Nagano Pref, A.
to last abdominal tergites shagreened. Shinohara leg.
VOLUME 93, NUMBER 3 657
Figs. 32-38. 32-36, Nematinus shinohari. 37, 38, A^. helvipes. 32, 37, sawsheath, dorsal view. 33, 38, saw-
sheath, lateral view. 34-36, variation ofmaculation ofthorax, dorsal views.
Paratypes:(Hokkaido)one female, 1 1. VI. resembles A^. variabilis, but it is easily dis-
1982, Shiokari, Ishikari; 1 female, 26-27. tinguished from the latter by the entirely
VI. 1987, Nakayama-toge, Noboribetsu; black mesoscutellum (in variabilis, the me-
(Honshu) 1 female, 24. VII. 1984, Renge- soscutellum is mostly reddish yellow), by
onsen, foot ofMt. Shirouma, Nagano Pref thelargemaculaeofthemesonotum(in var-
All paratypes collected by A. Shinohara. iabilis, the mesonotum has two to five
Holotype and 2 paratypes are deposited in smaller maculae, compare Figs. 3, 12-14,
National Science Museum (Nat. Hist.), To- and 34-36), by the coloration ofthe stigma
kyo. One paratype is deposited in the Na- ofthe forewing (in variabilis it is pale yel-
tional Museum of Natural History, Wash- low), and by characters ofthe lancet (com-
ington, D.C. pare Figs. 6 and 39).
Remarks.—This new species very closely Variation.—The maculation of the me-
65K l'l<(K I.IIMNdSOl nil. INIOMOIOdK AI,S(K III Y Ol WASIIIN(i ON
I
xr
ligs. V),Ai). liirucls. V), Ncinitlnms \hiuiih(ii(ii Ai), N hrlvipcs.
sopracsculum varies lioiii nearly all black dig. 30); lateral furrows distinct and deep;
(Fig. 34) to a triangular black macula digs. postocellar furrow depressed; interoccllar
IS and '\()), and IIr- niaculalion oltlK- nu'so- furrow distinct; li-shaped furrow anterior
nolal lateral lobes varies Ironi a large, to front ocellus as shown in lig. 29; frontal
oblique, black macula(Fig. 34)to lourblack area nearly flattened, with a surrounding
mac lilac digs. 3^ and 36). Tlie mac illation furrow but anterior portion indistinct; me-
ofthe |)osllergile varies liom enliiely black dian fovea rather elongate; lateral foveae
to nearly all reddish yellow digs. 34-36), distinct, each with a conical like projection
and the niaculalion ol the metanotiim var- in middle; ratio between antcnno-ocular
ies Irom entirely black to entirely reddish distanceand anlennal socketsabout 1.3:1 .0;
yellow digs. 34-36). malar s|)ace longer than diameter of front
ocellus (ratio between them about 1.0:0.6);
postorbilal groove distinct.
Nematinus helvipcs o^ashi,
I Thorax: normal; hind basitarsus as long
Ni'W Sn( IIS as following, 3 segmentscombined (ratio be-
(l-igs. 29-31, 37-3H, and 40) tween them about 1.0: 1.0); inner hind tibial
Female.—Length 7-8.S mm. Body black spur slightly longer than halflength ofhind
with followini', parts reddish yellow to red- basitarsus (ratio between them about 1.0:
dish brown: labial and maxillary |)alpi, leg- I .H). .i/xJonicn:normal; sawshealh as in ligs.
ula, and cercus. Antenna black but under 37 and 3X; lancet with 3 serrulae (Fig. 40).
I
silllace dark brown to dark reddish brown. I'linctation. I lead and thorax except for
Wings hyaline, veinsand sti|',ma dark brown. mc-sosculcllum and poslleigitecovered with
Fegs pale reddish yellow, but all coxae black seligerous piinc tiires, posterior halfofmeso-
except lor reddish yellow apical portions. scutellum covered with rather large and
Ilcitd: poslocellai area nearly rectangular shallow punctures, anterior half of meso-
VOLUME 93, NUMBER 3 659
sculcllum nearly impunciatc but with 3 or 4 A( KNOWLEDGMENTS
shallow longitudinal furrows, posttcrgitcand I wish toexpress my sincere thanks to Dr.
mctasculcllum covered with fine sctigerous David R. Smith, USDA, Washington, D.(
punctures. Abdominal tergiles shagrecned. for reviewing the manuscript, and to Dr. A..,
Male.—Unknown. Shinohara, Department of Zoology, Na-
Distribution.—Japan (Hokkaido and tional Science Museum (Nat. Hist.), Tokyo,
Honshu). forthe loan ofthe valuable specimens. am
I
Ilolotypc: female, 21-23. VI. 1989, Ka- indebted to Mr. M. Viitaasari, Department
mikochi, Nagano Pref., A. Shinohara leg. of I'orest and Agricultural /oology. Uni-
/'«ra/y/^rsvtwo females, 16. VI. 1979, Nu- versity of Helsinki, Helsinki, Finland, for
kabira, altitude 6()()-7()() m, Hokkaido. Ho- the loan ofthe specimen of/V. ca/cdonicus.
lolype and one paratype are deposited in
National Science Museum (Nat. Hist.), JO- Literature Cited
kyo, and one paratype is deposited in the rakeuchi, K. 1952. A generic classification of the
National Museum of Natural History, Japanese enthredinidae (Hymenopteia: Sym-
I
Washington, D.C. phyta). Kyoto, 90 pp.
Remarks.— Ihis new species isclosely al- . 1956. Sawllies ofthe Kurile Islands (II). In-
secta Malsumuiana 19: 71-SI.
lied to A^. ruhrocaudatus, but it is easily dis- logashi, I. 1964a. On some sawllies (llyni.: .Sym-
tinguished from the latter by the black ab- phyla)ofthenorthern partoftheJapan Alps. New
domen (in ruhrocaudatus, the lastabdominal lintomologist I3: 43^4.
segment and sawshealh are reddish brown), I964b. New and unrecorded species ol llu-
by the yellowish hind femur and tibia (in siiblaniily Neniatinae(Mym.: Syinphyta)fromJa-
fruehmruorcaaunddattuisbi,atahreeabpliaccakl),poarntdiobnyocfhatrhaechtienrds spuabn.fa(12m)9i.6l6Ky.oNnelNynCieiawt3i2an:aned47(9lul-nyr4meX.c3:o.rSdyemdplisy|)teac)iefsroolmJtah-e
ofthe lancet. pan (3). Ihe i.ile Study (lukui) 10: 4-5.