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J. New YorkEntomol. Soc. 102(1):102-106, 1994 ARADUS PERICARTI, A NEW SPECIES FROM SOUTH AMERICA (HETEROPTERA, ARADIDAE) Ernst Heiss Entom. Research Group, Tiroler Landesmuseum, J.-Schraffl-Str. 2A, A-6020 Innsbruck, Austria Abstract.—A new species ofneotropical Aradus is described from Surinam. Habitus, male genitalicandotherstructuresareillustrated. Akeyisgiven forthe six SouthAmericanspecies ofAraduswith bicolored antennae and theirantennaeare figured. ThegenusAradusshowsapreponderantlyHolarcticdistributionandisrepresented in the Nearctic Region by 78 species, but only 10 are known to date from the Neotropical Region (Kormilev and Froeschner, 1987:1 1). Most ofthem belong to the “falleni” species group which is characterized by a caudoventral opening ofthe male genital segment VIII and bicolored antennae. All ofthem seem to be rare in collections although they are good flyers and mostly collected at light. Theirbiology and ecology are still unknown. Specimens from Surinam proved to belong to a new taxon which is described below. To ascertain the identity ofneotropical species described by Stal in the last century it was necessary to revise his type material. A paper with the results ofthe type-investigation is in press. Aradus pericarti, new species (Figs. 1-3, 9-19) Diagnosis. Distinguishedfromallneotropicalmembersofthefallenispeciesgroup by its shape and coloration ofthe antennae and the male genitalic structures shown in Figures 9-19. Description. Male. Macropterous; body elongate, its surface and appendages cov- ered with fine granulation which partially bears short bristles. Head. Shorter than width across eyes (33/37); clypeus constrictedat middle, apex rounded. Antenniferous tubercles reaching Vi ofantennal segment I, apices acute. Eyes large, globose. Preocular tubercles distinct, blunt. Postocular portion ofhead rounded, strongly convergingposteriorly, without postoculartubercles. Vertexgran- ulate mediallywith 2(1 + 1) smooth, ovaldepressionslaterad, posteriorlydelimited by a thin v-shaped whitish transverse callosity. Antennae. 1.59 x as long as width ofhead across eyes; segment I subcylindrical, segmentsII toIVdepressed;IIconstrictedatbase,apicallyenlargedandwithparallel sides as segments III and IV. Rostrum arising from an open atrium, reaching 34 of prostemum. Pronotum. 1.75 x widerthanlong(58/33); lateralmarginsstraightandconverging anteriorly, anterolateral lobes angulately rounded, anterior margin dentate laterally. Disk with 4 longitudinal carinae and carinate humeri. Scutellum. Triangular with elevated lateral margins, disk raised at basal V3. 1994 ARADUSPERICARTI 103 Figs. 1-8. 1-3.Araduspericarti, newspecies. 1. Habitusofmaleholotype. la. Lateralview ofrightantenna. 2. Female, venter. 3. Female, abdomen dorsal. 4—8. Antennaeofneotropical Aradus. 4.penningtoni. 5. brasiliensis. 6.falleni. 7 fronterana. 8. mexicanus. Scale 0.5 mm. . Abdomen.Lateralmarginsstraight,slightlyconverginganteriorly.Hemelytracom- plete, corium reaching anterior border ofdorsal laterotergite (dltg) VI; membrane hyaline with distinctveins. Spiracles II to VII ventral, VIII dorso-lateraland visible from above. Genitalic structures. Genital segmentVIII cup-likewithexpandedandraisedpos- teriorlobes and a caudoventral oval opening (Figs. 12-14). Pygophore globose, flat- tened dorsally (Fig. 9). Parandria as Figure 19; parameres as Figures 15-18; tergite 104 JOURNALOFTHE NEW YORKENTOMOLOGICALSOCIETY Vol. 102(1) Figs. 9-19. Araduspericarti, new species. 9. Pygophore dorsal. 10. Left lobe oftergite IX dorsal. 11. Dto. lateral. 12. MalegenitalsegmentVIII lateral. 13. Dto. dorsal. 14. Dto. caudal. mm 15-18. Left paramere in different positions. 19. Parandrium lateral. Scale 0.2 for Figure mm mm 9, 0.5 forFigures 12-14, 0.1 forFigures 10, 11, 15-19. 1994 ARADUSPERICARTI 105 IX formed by 2 (1 + 1) lobes with acute apices which are curved downwards (Figs. 10, 11). Legs.Slender.Trochantersoffore-andmiddlelegsfused,thoseofhindlegsmarked by a distinct suture. Female. Similar to male but larger and abdomen more rounded laterally. Para- tergites VIII as Figures 2, 3. Coloration. Generally dark brown to black, but legs are usually oflighter color. Whitish-yellow are the median portion ofantennal segment II, segment III except the base and the posterior-exterior angles ofdltg III to VII on dorsal and ventral side. Etymology. Dedicated to my friend and eminent French heteropterist Mr. Jean Pericart, in occasion ofhis 65th birthday. Holotype. Male, Surinam, MarowijneProv., Oelemari River, Oct. 88 lg. Vincenti, in coll. EH. Paratypes.26$, 32$collectedwithholotypeincoll.EH,aparatypewillbedeposited in USNM, Washington. Measurements. Holotype6: Length4.8 mm; widthofabdomenacrosscorium 1.52 mm. Paratypes22: Length 5.15, 5.25, 5.55 mm; respectivewidthacrosscorium 1.72, 1.73, 1.85 mm, across tergite IV 2.2, 2.2, 2.37 mm. Relative length of antennal segments basically as in males. DISCUSSION The South American Aradus fauna comprises 5 species with bicolored antennae, but mexicanus, Usinger 1936, which is also found in Brazil, lacks the caudoventral opening ofthe male genital segment VIII. A.fronterana Drake, 1942, was also de- scribedfromMexicobutoccurspossiblyinNorthernSouthAmericaandistherefore included in the key. It might have been confused with the widespreadfalleni Stal, 1860. These 6 species can be separated by the following key: KEY TO SOUTH AMERICAN ARADUS WITH BICOLORED ANTENNAE 1 (2) Antennal segment II with apical xk> whitish, basal lA ofIII dark, IV whitish (Fig. 8), male segmentVIII withouta caudoventral opening mexicanusUsinger 2 (1) Whole antennal segment II dark (Figs. 4, 5) or predominantly yellowish (Figs. 1, 6, 7), caudoventral openingpresent 3 3 (6) Antennal segment II entirely dark 4 4 (5) Onlyantennal segment III yellowish (Fig. 4) penningtoniDrake 5 (4) Antennal segment III and basal halfofIVyellowish (Fig. 5) brasiliensisUsinger 6 (3) Antennal segmentII predominantlyyellowish (Figs. 1, 6, 7) 7 (8) AntennalsegmentIIdepressed,itsbasalandapicallAdark, IIIyellowishwithdark base, IVdark (Fig. 1) pericartin. sp. 8 (7) Antennal segment II not depressed, coloration ofantennaedifferent 9 9(10) Antennae yellowish to brown, usually segment I, basal lA of II and III darker, segmentII constrictedatbase (Fig. 6) falleniStal 10 (9) Antennae yellowish with segment I, basal XA ofII, base ofIII and apical xh ofIV dark, segment II longerand evenlytaperingtowardsbase (Fig. 7) . . .fronterana Drake . 106 JOURNAL OFTHE NEW YORK ENTOMOLOGICALSOCIETY Vol. 102(1) ACKNOWLEDGMENTS I want to thank Dr. R. T. Schuh forreviewingthe manuscript. LITERATURE CITED Champion,G.C. 1898. Fam.Aradidae. In:BiologiaCentrali-Americana,Rhynch.11:65-117. Drake, C. J. 1942. Two new American speciesofthe genus Aradus Fabr. (Hemiptera). Rev. Ent., Rio de Janeiro 13:151-154. Heiss,E. 1993. TyperevisionofNeotropicalAradusdescribedbyC.Stal(Heteroptera,Aradidae). Mitt. Munch. Ent. Ges. 83:119-125. Kormilev, N. A. 1951. Aradidae Argentinos 1. Comun. Inst. Nac. Cienc. Nat., “Bernardino Rivadavia,” Cienc. Zool. 2:83-95. Kormilev, N. A. and R. C. Froeschner. 1987. Flat Bugs ofthe World. A Synonymic List (Heteroptera: Aradidae). Entomography 5:245 pp. Stal, C. 1860. Bidrag till Rio Janeiro-Traktens Hemipter-fauna. Part I. Kongl. Svenska Ve- tensk.-Akad. Handl. 2(7):1-84. Usinger, R. L. 1936. Studies in the American Aradidae with descriptions ofnew Species. Ann. Ent. Soc. Amer. 29:490-516. Usinger, R. L. 1940. A new species ofAradusfrom Brazil (Hemiptera, Aradidae). Rev. Ent. 11:639-642. Wygodzinsky, P. 1943. Notas sobre as especies brasileirasdo generoAradus(Aradidae, He- miptera). Rev. Ent. 14(3):502-510. Wygodzinsky, P. 1944. Additional notes on the Brazilian species ofthe genus Aradus (Ar- adidae, Hemiptera). Rev. Ent. 15(3):329—331 Received 1 June 1993; accepted 26 July 1993.