Studies of Neotropical caddisflies, 46: the Trichoptera of the Rio Moche Basin, Department of La Libertad, Peru

19 Pages·1991·7.2 MB·English

PROC. BIOL. SOC. WASH.
104(3), 1991, pp. 474-492
STUDIES OF NEOTROPICAL CADDISFLIES, XLVI:
THE TRICHOPTERA OF THE RIO MOCHE BASIN,
DEPARTMENT OF LA LIBERTAD, PERU
Oliver S. Flint, Jr. and Luis Reyes A.^
Abstract.—Twenty-fourspeciesarerecordedfromtheRioMoche(primarily)
and Rio Saiia basins ofnorthwestern Peru. The climatological, chemical, and
life zone characteristics of the Rio Moche are discussed. Six species are de-
scribed as new: Chimarra (C.) dolabrifera, C. (Curgia) otuzcoensis, Smicridea
{Rhyacophylax) bidactyla, Hydroptila sicilicula, Neotrichia riparia, and Triae-
nodesperuanus. Thetrichopterous faunaofthisregion isbasicallyone ofwide-
spread species, some known from the U.S.A. to Chile.
ThetrichopterousfaunaofPeru,thethird ingthe Pacific Oceanjust south ofTrujillo,
largest country in South America, is very its capital (Fig. 1). The drainage basin is
poorly known. There have been very few about96kmdeep,wideningtoabout25 km
studies dealing exclusively with Peru, and atthe ocean, andcovering 2708 square km.
these are limitedto very restricted portions It is situated between parallels 7°46' and
(Martynov 1912; Roback 1966; Hint 1975, 8°15' South and between meridians 78°16'
1980), thusmost Peruvian recordsare scat- and 79°08' West.
tered throughout the literature. Reyes has The river itself is 102 km long with an
compiledalistof107 speciesrecordedfrom averagegradientof4%(thisandthe follow-
Peru(includingthosenewlyreportedinthis inginformation is extractedprimarilyfrom
paper), which is certainly but a small frac- Anonymous 1973, 1987). Itsoriginisinthe
m
tion ofthe number ofspecies that must oc- Laguna Grande at 3988 elevation, near
cur there. Essentially nothing has been re- the town of Quiruvilca in the Province of
corded from the coastal and immediately Santiago de Chuco, from which it flows
adjacent montane zones ofnorthern Peru. through the Provinces ofOtuzco and Tru-
This is the firstreport ontheTrichopterous jillo(Fig. 2). JustbelowthetownofSimbal,
fauna that may be expected in other such at 576 m, it is joined by the Rio Sinsicap,
suitablesitesinthesedryregionsofwestern which originates above the village of Sin-
SouthAmerica.Materialonwhichthisstudy sicap at over 3000 m. Most of the collec-
is based is deposited in the National Mu- tions were made in the portion ofthe Rio
seum ofNatural History (NMNH), Wash- Sinsicap between Simbal and the junction
ington and the Museo de Historia Natural with the Rio Moche. This section of the
"Javier Prado," Lima, Peru. river is called by local inhabitants the Rio
Lucumar(Figs. 3, 4)anditdividesinto sev-
eral arms, which reunite near the village of
Rio Moche Basin
Cumbray at which point it takes the name
The Rio Moche basin is wholly located ofCumbray Creek(Figs. 5, 6) and serves as
in the Department of La Libertad on the the laundry area for the small village.
northwestern coast ofPeru, the river enter- The rains in the basin are concentrated
from January to April, with the driest pe-
' Pleaseseepostscript. riod from June to September. The average
VOLUME 104, NUMBER 3 475
790
AMAZONAS
LAMBAYEOUE
MARTIN
Fig. 1. MapshowingtheplacementoftheRioMochebasin(stippled)intheDepartmentofLaLibertad,its
provincial subdivisionsanditspositionin Peru.
m
annual rainfall in the littoral is about 10 Puente Moche the river still runs 3-4 by
mm, rising perhaps to 100 mm at Simbal 50-80 cm in the dry season and 12-15 m
(average annual rainfall at nearby Samne, by 1 m in the rainy season. An analysis of
1450 m is 162 mm), and to near 1500 mm the water ofCumbray Creek gives a pH of
atthe river's origin (average annual rainfall 7.5, conductivity of0.78 mmhos/cm, sum
atQuirivilcais 1389mm).Duringlowwater of cations 9.2 meq/1 (Ca 4.2, Mg 2.6, Na
flow the Rio Lucumar near Simbal is 1-1.5 2.4, K 0.05), sum ofanions 9.2 meq/1 (CO3
m wide by 30-50 cm deep (Fig. 3), increas- 0, HCO3 3.5; NO3 0, SO4 4.5, CI 1.2).
ingto2.5 mby 50-70cmintherainyseason The Rio Moche over its course passes
(Fig. 4). The Cumbray Creeksection is abit through five Holdridge life zones (Tosi
larger, in the dry season 1.5 m by 50 cm 1960). It arises in "pradera muy humeda
(Fig. 5) but 3 m by 60-80 cm in the wet montano (pmh-M)" which has an annual
(Fig. 6). Much ofthe waterofthe lower Rio rainfall of 1000-1400 mm, passing at ap-
m
Moche is diverted for irrigation, but at proximately 3700 into the "pradera hu-
476 PROCEEDINGSOFTHEBIOLOGICALSOCIETYOFWASHINGTON
Fig. 2. Detailsofthe Rio Moche, its tributariesand principaltowns.
meda montano (ph-M)" which lies in an is situated below this zone in the "desierto
annual rainfall regime of 500-1000 mm. pre-montano (d-PM)," which runs to the
Between elevations of 1600-2800 m, with mouth ofthe riverwith rainfall between 0-
annualrainfallsintherangeof200-500mm 50 mm.
theriverflowsinthe"estepaespinosomon- The streamside vegetation at Cumbray
tano-bajo (ee-MB)" zone. In the zone of Creek is dominated by Baccharis sp. (Fig.
Simbaland Cumbray Creek, where most of 5), with other typical plants of this zone:
the collections were made, at elevations of Cereus macrostibas, Cereus candelaris,
m mm
500-1800 and rainfalls of 50-200 Capparis sp., and Caesalpinia sp. Typical
the life zone is denoted as "matorral deser- plantsofthecoastalzoneare: Capparisspp.,
ticopre-montano(md-PM)." PuenteMoche Crytocarpus sp.. Acacia macracantha.
Figs. 3-4. Rio Lucumar, near Simbal, site ofthe collections of Triaenodesperuanus: 3, dry season, June
1988; 4, wetseason, January 1989.
VOLUME NUMBER
104, 3 477
Figs. 5-6. CumbrayCreeksection,nearCumbray:5,dryseason,showingBaccharistheprincipalcomponent
ofthe flora, June 1988; 6, wetseason, January 1989.
Arundodonax, Ginerium oleander, Schinus Americas,includingtheGreaterAntillesand
molle, Tessaria integrifolia, Baccharis sp. the southwestern United States. Nine spe-
and Ludwigia sp. cies have been recorded from Peru, but un-
doubtedly many more will be found with
Distribution more extensive collecting. The cleared gen-
italia ofthe examples taken in this survey
Figure 7 shows the known distributions
revealtwo verydistinctive species, butthey
of the twenty-four species of Trichoptera
cannotbespecificallyidentifiedasmalesare
taken in this survey that could be specifi-
lacking.
cally determined. Four of the species are
recorded only from the Rio Moche basin, Species 1 is known only from larvae and
while three additional species are known a female metamorphotype, thus its wing
lengthandgeneral colorationare unknown.
with certainty only from adjacent Ecuador
or Peru. However, the majority are distrib-
tuotetdheinUt.oSC.eAn.troarltAhmeeWreiscat,InMdeixeiscaonodraevfeenw Species \\D.ist. <D g1S 3 >i3 1 i 11 s. •n 1
are also known to live as far south as Ar- Protoptila tojana X X X X X
gentina or Chile. Protoptila orotina X X
Thus, it seems that the somewhatdepau- CChhiimmaarrrraadeomliabmraifera X X XX XX
peratetrichopterousfaunaoftheRioMoche ChimairaotuEcoensis X
Polycentropusjoergenseni X X X X X X
Basin, atleastupto 500-600 m, is onewith Smicrideabiviitata X X X X X X
most species having a wide distribution in Smicridea saucia X X
Smicrideamurina X X X X X X X
CentralAmericaandnorthernSouthAmer- Smicrideabidactyla 9 X X
ica. Wepredictthattheapparentlyendemic Zumatricliiapalmara X X X
specieswill be foundto existas farnorth as HHyyddrrooppttiillaacdointsatlreiacta XX X X X X XX
Ecuadorand southperhaps to central Peru, Hydroptilagrenadensis X X X X X
ifnot farther. The fauna here reported will HNyedortorpicthiilaarsiipcairliiacula XX
probably be found in similar coastal river Neotrichia gotera X X
systems between central Ecuador and cen- Ochrotrichia tenanga X X X X
Ochrotrichia malada X X
tral Peru. Oxyethira parce X X X X X X X X X
Nectopsyche spiloma X X X X X
Nectopsyche punctata X X X X X X X X
Family Hydrobiosidae Triaenodespenianus X
Atopsyche species 1 Helicopsychevergelana X X X X X
Fig. 7. Known distributions ofthe identified spe-
This is a very large genus of over 100 ciesofcaddisfliescollectedintheRio MocheandRio
describedspecies, limitedexclusivelyto the Sanabasins.
1
478 PROCEEDINGSOFTHEBIOLOGICALSOCIETYOFWASHINGTON
The general body size of the pupa would Protoptila orotina raposa Flint
indicate that it is quite a bit smaller than
Protoptila orotina raposa Flint, 1974a:13.
the following species, perhaps with a fore-
wing length ofonly 1 mm. This subspecies was described from the
Material.—Fern,Dept. LaLibertad,Prov. wet Pacific coast of Colombia; this is the
Trujillo, Dist. Simbal, Rio Lucumar-Cum- secondknownoccurrenceofthesubspecies.
bray Creek, 17 Sep 1989, L. Reyes A., 2 The nominate subspecies is found widely
larvae, 3 prepupae, 3 pupae, 1 9 metamor- along the drier Pacific coast ofCosta Rica
photype. and Panama.
Material.—Peru, Dept. Lambayeque, Rio
Saiia, Oyotun, 200 m, 18 Nov 1989, L.
Atopsyche species 2
Reyes A., 9 S.
This species, only known from a single
mm
female, hasaforewinglengthof13 and
a dark coloration. Family Philopotamidae
Material.—Peru,Dept. LaLibertad, Prov. Chimarra (Chimarra) dolabrifera,
Otuzco, Dist. Otuzco, Rio Polio, Otuzco, new species
2620 m, 1 Jul 1989, L. Reyes A., 1 2. Figs. 8-1
This speciesiscloselyrelatedto C. platy-
Family Glossosomatidae rhinaHintfromVenezuela. Itisrecognized
Protoptila tojana Mosely bydifferencesinthetenthtergitesandclasp-
ers ofthe male genitalia. The tenth tergite
Protoptila tojana Mosely, 1954:331.—Flint,
in C.platyrhinaisslightlyupturnedapically
1963:476.-Maes&nint, 1988:2.
in lateral aspect and only slightly expanded
The species was described from southern indorsalaspect; in C. dolabriferathetergite
Mexico, andrecordedfromHonduras, Nic- is straight apically with a distinct dark pro-
aragua, Costa Rica and Lima, Peru, thus jectionsubapicallywhichindorsalaspectis
exhibiting the greatest known range ofany seen to be a sharp point directed laterad.
speciesinthegenus.Thereisadditionalma- The clasper of C. dolabrifera in posterior
terial from Guatemala, El Salvador, Pana- aspecthas its dorsal processdevelopedinto
maandEcuadorintheNMNH. Itspresence adistinctmesallobewhichin C.platyrhina
in northern Peru is, therefore, not surpris- is totally lacking.
ing. Inadditiontotheadults, larvae, pupae, Adult.—Lengthofforewing,4.5mm.Col-
and male and female metamorphotypes oroverall fuscous, unicolorous; legsbasally
have been taken. a bit paler. Forewing with a bulla on Rs;
Material.—Peru,Dept. LaLibertad,Prov. hindwing with 4 branches to Rs and 3 to
Trujillo, Dist. Simbal, Rio Lucumar, Sim- M. Male genitalia: Ninth segment with an-
bal, 11-12 Dec 1987, L. Reyes A., 4 S; 24 teriormargin producedventrolaterally, with
Jun 1988, 3 a, 1 2; 6 Jul 1989, 14 3, 1 2; 22 a short dorsolateral process; posteroventral
Jul 1989, 29 6, 2 2; 5 Sep 1989, 5 S. Rio process triangular in outline, about as long
Lucumar, Cholocar, 17 Sep 1989, 1 S. Rio as wide basally. Tenth tergum with a pair
Lucumar-Cumbray Creek, 15 Apr 1988, 1 ofelongatemesalplates, mostheavilyscler-
(3. Dist, Laredo, Rio Moche, Conache, 28 otized along dorsal margin; lateral plate
Jul 1989,.6 S, 4 2. Dist. Moche, Rio Moche elongate, tapering apicad with a midlateral
near Puente Moche, 18 Jul 1989, 6 3, 4 2. more strongly sclerotized ridge ending in a
Dept. Lambayeque, Rio Sana, Oyotun, 200 darkknob subapically, in dorsal aspect this
m, 18 Nov 1989, 7 6. knob is produced as a sharp laterally-di-
VOLUME 104, NUMBER 3 479
Figs. 8-16. MalegenitaliaofChimarra. 8-11, C. dolabrifera: 8, lateral; 9, ninthandtenth terga, dorsal; 10,
C
clasper, posterior; 11, phallus with endotheca everted, lateral. 12-16, otuzcoensis: 12, phallus, lateral; 13,
apex ofphallus, dorsal; 14, lateral; 15, eighth, ninth and tenth terga, dorsal; 16, ninth sternum and claspers,
ventral.
rectedpointandtheridgeexpandedatmid- terior aspect. Phallus with an apicoventral
length. Clasperwithabroad, scooplikeven- spine, a pair ofsubequal internal spines, a
tral portion and an apicodorsal process slender rod and ring assembly, and a dark
elongate and narrow in lateral aspect, but spiculatepouchwithasmallscleritebearing
bearing a distinct mesal expansion in pos- a cluster ofsmall spines.
480 PROCEEDINGSOFTHEBIOLOGICALSOCIETYOFWASHINGTON
—
Material. Holotype, male: Ecuador, represented by a distinctly setate area, and,
Prov. Pichincha, Rio Palenque Biological secondly,thetenthtergumisdeeplydivided
Station, 47 km S SantoDomingodelosCo- mid-dorsally with the lateral portions nar-
lorados, 750 m, 29 Jul 1976, J. Cohen, rowandrodlike. Thearmatureinternallyat
NMNH. Paratypes: Same data, 3 S; same, the apex ofthephallus isalso verydifferent
but 14 km E Santo Domingo delos Colora- from anything seen in congeneric species.
dos, 5Jul 197W5,Langley&Cohen,25;same, Adult.—l^ngXh. of forewing, 7-8.5 mm.
but 29 km Santo Domingo de los Co- Color overalljet black, immaculate. Fore-
lorados, 6 May 1975, P. J. Spangler, 1 6. wing without bulla in the radial system;
Prov. Los RIos, Rio Palenque Biological hindwing with 4 branches to Rs and 3 to
Station, 56 km N Quevedo, 220 m, 7 Jan M. Male genitalia: Eighth sternum narrow,
1978, P.WJ. Spangler, 1 3. Prov. Cotopaxi, parallel-sided, posterior margin concave;
133 km Latacunga, 1080 ft [327 m], 2 tergum produced posteriad into a pair of
Jul 1975, Langley & Cohen, 6 a. Prov. Es- rounded, submesal lobes. Ninth segment
meraldas. La Union, 3 Feb 1979, J. J. An- producedintoaroundedanteroventrallobe;
derson, 1 $. Peru, Dept. La Libertad, Prov. with a small posteromesal keel; posterolat-
Trujillo, Dist. Simbal, Rio Lucumar, Sim- eral margin slightly produced and angulate
bal, 17Jun 1988,L.ReyesA., 93, 3 2; same, atmidlength. Cercusapparentlycompletely
but Rio Lucumar-Cumbray Creek, 430 m, fused to lateral surface oftenth tergum, ap-
10Mar 1987, 63, 3 9; same, but5 Sep 1987, parent only as a setate area. Tenth tergum
10 3, 4 2. Dist. Moche, Rio Moche near inlateralaspectbroadbasaUy,producedinto
Puente Moche, 12 Dec 1988, 1 5. anapical,noselikelobewithmanysensillae;
in dorsal aspect with a deep, U-shaped,
mesal excision separating lateral arms.
Chimarra {Chimarra) emima Ross
Clasper elongate, rectanguloid with a small
Chimarra {Chimarra) emima Ross, 1959: apicodorsal point in lateral aspect, in ven-
172.-Hint, 1991. tral aspect with an apicomesal lobe from
dorsal margin. Phallus tubular, inflated ba-
Thespecieswasoriginallydescribedfrom
saUy;apexwithathin,pointedprocessfrom
Panama, and since recorded from Nicara-
dorsolateral surface on each side; a pair of
gua, Costa Rica, Colombia and Ecuador.
long, arched, black spines dorsally, and a
This is the first record ofthe species from
shorter pair ofblack spines laterally; mid-
Peru.
ventrally with a large, black spine whose
Material.—Peru, Dept. Lambayeque, Rio
Sana, Oyotun, 200 m, 18 Nov 1989, L. apex is trifid in ventral aspect and which
bears a pair ofslender basal processes.
Reyes A.,1 6, 1 2. Material—YioXoXy^c, male: Peru, Dept.
La Libertad, Prov. Otuzco, Dist. Sinsicap,
Chimarra (Curgia) otuzcoensis, RioSinsicap,Sinsicap,2000m,23Sep 1989,
new species L.ReyesA.,NMNH. Paratypes: Samedata,
Figs. 12-16 15 3, 3 2.
Within the New World species of Chi-
marra this species is placeable no further Family Polycentropodidae
than to subgenus. The genitalia offer two Polycentropusjoergenseni Ulmer
previously unknown character states: the
cercus is at first sight lost, but it would ap- PolycentropusJorgenseniUlmer, 1909:75.—
pear to have completely fused with the lat- Fischer, 1962:83.-Weidner, 1964:91.
eral surface ofthe tenth tergum and to be Polycentropus colombiensis Banks, 1910:
VOLUME NUMBER
104, 3 481
160.-Fischer, 1962:67.-Hint, 1967:6 This is a common, widespread species
(new synonymy). from Mexico south to Ecuador, and east-
Polycentropus anomalus Navas, 1923: wardly across northern South America to
201.—Fischer, 1962:66 (newsynonymy). Suriname;thisisthefirstknownrecordfrom
Peru.
This species is very widely distributed
Material.—Peru, Dept. Lambayeque, Rio
alongtheAndesMountainsofwesternSouth
America. Examples have been seen from Saiia, Saiia, 5 Nov 1989, L. Reyes A., 1 <3.
Argentina, Bolivia, Colombia, Ecuadorand
Venezuela; Peru is here added to the list. Smicridea (Smicridea) saucia
The types ofall three names have been McLachlan
studied by Flint. The male lectotype from Figs. 17-21
Pedregal, Argentina, is in the Zoologische
Staatsinstitut und Zoologisches Museum, Smicridea saucia McLachlan, 1871:137.—
Hamburg, Germany. Amale syntype, bear- Kimmins, 1957:106.-Fischer, 1963:134.
ingaNavas"Typus" label (andherebydes-
ignated the lectotype), ofP. anomalus Na- This species was originally described in
vasfrom "LaGranja(AltaGracia)Prov. de 1871 from Peru "probably in the neighbor-
Cordoba 1-8.IV.1920 C. Bruch" is in the hood ofLima," but has not been collected
Museo Argentino de Ciencias Naturales since. It is, therefore, with a great deal of
"Bernardino Rivadavia," Buenos Aires, pleasure that we record it again from Peru.
Argentina. The female holotype of P. co- Many years ago Flint borrowed the lecto-
lombiensis Banks, temporarily at the Na- type and 3 paralectotypes from the British
tionalMuseum ofNatural History, is prop- Museum (Natural History), preparing
erty of the Museum of Comparative drawings from them which are here pub-
Zoology, Cambridge, Massachusetts. The lished so thatfutureworkers mayrecognize
genitaliaofthelectotypeofP. anomalushas the species. The examples from Trujillo
been cleared and found to agree with that Province are in complete agreement with
ofP. joergenseni from western Argentina. the lectotype. However, the series from
mm
The P. colombiensis female type also has Otuzco are 1-2 larger (forewing length
mm
beenclearedanditsgenitaliacomparedwith 6-7 as opposed to ca. 5 mm), and the
females associated with males of P. joer- sclerites at the tip ofthe phallus seem a bit
genseni from several different regions, and different(Fig. 21). However, consideringthe
all found in agreement. overallsimilarityandlackofadditionalcol-
Material.—Fern, Dept. LaLibertad, Prov. lections, theyare consideredconspecific for
Otuzco, Dist. Sinsicap, Rio Sinsicap, Sin- now.
sicap, 2000 m, 23 Sep 1989, L. Reyes A., 2 The coloration ofthese fresh specimens
3, 2 2, 5 larvae, 2 pupae, 5 $ metamorpho- are almost uniformly fuscous, with un-
types. marked wings, the legs, however, are tes-
taceous toward their bases.
Material.—Peru, Dept. LaLibertad, Prov.
Family Hydropsychidae
Trujillo, Dist. Simbal, Rio Lucumar-Cum-
Smicridea (Smicridea) bivittata
(Hagen) bray Creek, 27 Jun 1988, L. Reyes A., 1 2;
14 May 1989, 1 $; 21 May 1989, 1 <5. Rio
Hydropsyche bivittata Hagen, 1861:291. Lucumar, Simbal, 8 Dec 1988, 1 9; 5 Sep
Smicridea {Smicridea) bivittata (Hagen).— 1989, 143,69. Prov.Otuzco, Dist. Sinsicap,
Fischer, 1963:131; 1972:144.-Flint, RioSinsicap,Sinsicap, 2000m,23Sep 1989,
1974b:16; 1981:22. L. Reyes A., 9 5, 3 9.
482 PROCEEDINGSOFTHE BIOLOGICALSOCIETYOFWASHINGTON
Figs. 17-25. MalegenitaliaofSmicridea. 17-21,5". saucia: 17,lateral; 18,ninthandtenthtergaandclasper,
dorsal; 19, apex ofphallus, dorsal; 20, phallus, lateral; 21, apex ofphallus ofspecimen from Otuzco, lateral.
22-25, 5. bidactyla: 22, lateral; 23, ninth and tenth terga and clasper, dorsal; 24, apex ofphallus, dorsal; 25,
phallus, lateral.
VOLUME NUMBER
104, 3 483
Smicridea (Rhyacophylax) murina margin ofthe tenth tergum. It is expected
McLachlan that these examples will prove to be only a
variation in the species.
SmicrideamurinaMcLachlan, 1871:137.— Adult.—Lengthofforewing, 4-5 mm. Eye
Fischer, 1963:134. ofmaleslightlyenlarged,widthmiddorsally
Smicridea {Rhyacophylax) murina Mc- Vithatofinteroculardistance. Coloroverall
Lachlan.-Hint, 1988:33. pale stramineous; forewing with faint dark
marks along chord and over thyridial nyg-
Thiswidespread species has an extensive ma, with apalersubterminalband. Antero-
synonymy (Fischer 1963, Flint 1988). It is lateral processes of fifth sternum of male
known from Nicaragua in Central America nearly twice as long as sternum; without
south along western South America to cen- internalsacs. Malegenitalia:Ninthsegment
tral Chile. Although it is frequently found with anterolateral margin produced into an
in wet, forested areas in Central America, angulatelobe,withastrongdorsolateralline.
itis equally at home in drier sites in waters Tenth tergum membranous dorsomedially,
open to the sun, perhaps explainingits suc- apex sharply upturned and produced into a
cess.Larvaeandafemalemetamorphotype, small point; ventrolateral margin strongly
probably ofthis species, have been taken in sclerotized, produced into anelongate, pos-
the Rio Lucumar. terolaterally directed process bearing a
Material.—Peru,Dept. LaLibertad, Prov. shorter, mesally directed branch. Clasper
Trujillo, Dist. Simbal, Rio Lucumar, Sim- with basal segment long, slightly inflated;
bal, 11 Dec 1987, L. Reyes A., 2 3; same, apical segment with tip obliquely rounded
but Rio Lucumar-Cumbray Creek, 430 m, in dorsal aspect. Phallus tubular, basal and
2 Jul 1987, 1 $; 23 Aug 1987, 2 <3. Dist. apical sections meeting at nearly 90°; with
Moche, Rio Moche at Puente Moche, 27 adorsolateral, saddle-shaped area ofspines
Jul 1988, 85. Dept. Lambayeque, RioSana, and midventral row of spines subapically;
Saiia near the ruins of Corbacho, 30 Sep apex with a semierect, dorsal, bilobed plate
1989, 4 5. and a narrow, ventral, tonguelike lobe; in-
ternal sclerite threadlike, slightly sinuous.
—
Material. Holotype, male: Ecuador,
Smicridea {Rhyacophylax) bidactyla, Prov. El Oro, 6 km E Pasaje, 13 Jan 1978,
new species P.J. Spangler&J.Anderson,NMNH. Para-
Figs. 22-25 types: Same data, 22 S, 4 9. Rio La Calera,
Pinas/Zaruma, 19-20Aug 1977, L. E. Pena
This distinctive species is a member of G., 1 3, 1 9. Victoria/Arenillas, 18-19 Aug
the signata group, closest to S. signata 1977, L. E. Pena G., 3 6, 30 9. Prov. Loja,
(Banks) itself, with which it shares the bi- Macara, 13 Aug 1977, L. E. Peiia G., 10 S,
lobedapicodorsalplate and ventraltongue- 2 9. Rio Puyango, 300 m, 17-18 Aug 1977,
like lobe on the phallus. It differs in pos- L. E. Peiia, G., 115. Prov. Los Rios, 1 1 km
sessing a small apicodorsal point and large S Quevedo, 3 Jul 1975, Langley & Cohen,
W
bifid ventrolateral process on the tenth ter- 3 6, 10 9. Prov. Pichincha, 29 km Santo
gum and lacking the lateral process on the Domingo de los Colorados, 6 May 1975,
phallus, but possessing a dorsal area and a Spangler et al., 7 5, 3 9. Peru, Dept. Lam-
midventralrowofspinulesinthe samegen- bayeque, Rio Safia, nearruins ofCorbacho,
eralphallicregion. TheexamplesfromVen- 30 Sep 1989, L. Reyes A., 4 5, 2 9. Other:
ezuela differ in lacking the dorsal patch of Venezuela, Edo. Barinas, Rio Santo Do-
spinesonthephallusandhavingonlya sin- mingo, Barinas, 17 Feb 1976, C. M. & O. S.
gle strong process from the ventrolateral Hint, Jr., 2 S, 5 9.