Additions to the classification of South American Diomini are provided. Male genitalia of Heterodiomus marchali Brèthes are described and Diomus brethesi is newly described

González F., Guillermo

Gordon, Robert D.

English

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237 INSECTA MUNDI, Vol. 17, No. 3-4, September-December, 2003IntroductionMales of Heterodiomus marchali BrŁthes wereunknown to Gordon (1999) and thus not described orillustrated in the revision of South American Diomini.Subsequently Guillermo Gonzalez F. provided malesof H. marchali and specimens of a previously un-known species of Chilean Heterodiomus BrŁthes.  Wehere describe this new species and the male of H.marchali.Specimens examined and illustrated are deposit-ed in the collections of Guillermo Gonzalez F. (GG),Museo Nacional de Historia Natural, Santiago, Chile(MHNS), and U.S. National Museum of NaturalHistory, Smithsonian Institution, Washington, DC(USNM).Heterodiomus marchali BrŁthesMale: Similar to female except apex of sternum 5broadly, feebly emarginate medially, apex of sternum6 abruptly, shallowly emarginate medially.  Genitaliawith phallobase, short, basal lobe slender, about aslong as paramere, without dorsal keel, without dorsalsetae, apex with 2 teeth on one side; paramere short,very wide, flat, with fine, sparse internal pubescence,not curved, widened in apical ‰, apex rounded (Figs.1, 2); sipho strongly rounded, apex acute, basal cap-sule with inner arm short, slender, apically castellat-ed, outer arm elongate, slender, without accessorypiece, basal margin rounded (Fig. 3).Specimens examined: 10.  Chile.  ￿Chile￿ (theholotype).  Isla Negra, San Antonio.Remarks: The male genitalia do not closely resemblethose of any other knownspecies of Heterodiomus, butthe extremely short, wide paramere is similar to thatof H. apparitorius (Weise).Heterodiomus brethesi Gonzalez and Gordon,new speciesDescription: Male, length 1.4 mm., width 0.8mm.  Form elongate, slender, sides slightly rounded.Color pale reddish yellow except elytron with scutellararea obscurely darkened (Fig. 8),  mouthparts, propleu-ron, epipleuron, and legs yellow.  Head alutaceous,feebly shiny, punctures extremely fine, nearly invis-ible, separated by less than to twice a diameter.Pronotal surface slightly alutaceous medially, shiny,strongly alutaceous and dull in lateral 1/3, punctureslarger than on head, separated by less than to twice adiameter.  Elytral surface alutaceous, feebly shiny,punctures larger than on pronotum, separated by lessthan to twice a diameter.  Eye small, frons 3.0 x widthof eye.  Abdomen with apex of sternum 5 broadly,feebly emarginate medially, apex of sternum 6 abrupt-ly, shallowly emarginate.  Genitalia with phallobaseelongate, basal lobe 2/3 length of paramere, withoutdorsal keel, without dorsal setae, apex with 2 teeth onone side; paramere elongate, without internal pubes-cence, flat, curved anterior to base, wide from base toapex, slightly wider in apical ‰, apex rounded (Figs.Descriptions of the male of Heterodiomus marchali BrŁthes anda new species of Chilean Heterodiomus BrŁthes(Coleoptera: Coccinellidae: Scymninae: Diomini)Guillermo GonzÆlez F.Sociedad Chilena de EntomologiaNocedal 6455, La ReinaSantiago, Chilewillogonzalez@yahoo.comRobert D. GordonNorthern Plains EntomologyP.O. Box 65, WillowCity, ND 58384 rdgordon@utma.comAbstract.  Additions to the classification of South American Diomini are provided.  Male genitalia ofHeterodiomus marchali BrŁthes are described and Diomus brethesi is newly described.238 Volume 17, No. 3-4, September-December, 2003, INSECTA MUNDI4, 5); sipho elongate, slender, apex acute, basal cap-sule with inner arm slender, outer arm short, wide,apically truncate, without accessory piece (Fig. 6).Female: Similar to male except apex of sternum5 truncate; apex of sternum 6 arcuate; spermathecalcapsule short, bent in apical ‰, base bulbous; ramuswith small beak; infundibulum long, thornlike; bur-sal apex with elongate plate (Fig. 7).Variation: Length 1.4 to 1.5 mm; dorsal color variesfrom that described above to entirely pale yellow inteneral specimens.Type material: Holotype male, Chile, Vallenar,Prov. Huasco, 16.I.1993, G. Gonzalez (MHNS).  Allo-type; same data as holotype (MHNS).  Paratypes: 16,6, same data as holotype;1, Chile,  Azapa, Km.1,Arica, I. Reg., 27.IV.1991, F. Gonzalez F.; 6, Chile, LaChimba, Antofagasta, 20.VII.1992, G. Gonzalez F.; 2,Chile, Las Condes, Santiago, 23.Dic.78, G. GonzalezF.; 1, Chile, Peæuelas. Elqui, IV. Reg., 27.IV.1991, G.Gonzalez F.  (MHNS) (USNM).Etymology: The species is named for Jean BrŁthes,the author of Heterodiomus and a significant figurein the classification of South American Coccinellidae.Remarks: This Chilean species is superficially verysimilar to the North American Diomus debilis (Le-Conte) but has quite different male genitalia. AmongSouth American Heterodiomus, it most closely re-sembles the Argentine H. celestine Gordon fromwhich it is distinguished by male genitalia. Genitaliaof H. brethesi have an elongate phallobase withslender basal lobe; genitalia of H. celestine have ashort phallobase with wide basal lobe.In the existing key to Heterodiomus species(Gordon 1999, p. 9), H. brethesi will go to couplet 4,which is modified as follows:4(3) Form elongate, tapered from basal 1/4 of elytra toapex; elytron reddish brown becoming graduallypaler from discal area to apex; dorsal surface verydull ............................................ canisius GordonFigures 1-3.  Male genitalia of Heterodiomus marchali.Figures 4-7.  Heterodiomus brethesi.  4-6) male genitalia;  7)female genitalia.1 234 567239 INSECTA MUNDI, Vol. 17, No. 3-4, September-December, 2003￿ Form elongate-oval; elytron uniformly pale or withobscurely darkened scutellar area...................55(4). Frons 2.0 x width of eye; male abdominal sternum6 barely perceptibly emarginate apically ............................................................ celestine Gordon￿ Frons 3.0 x width of eye; male abdominal sternum6 abruptly, shallowly emarginate............................................................................ brethesi, n. sp.AcknowledgementsWe thank A. Wheeler, Clemson University, SouthCarolina, and M. Pogue and A. Norrbom, SystematicEntomology Laboratory, Washington, DC, for manu-script review. The illustrations were prepared byGuillermo GonzÆlez.Reference citedGordon, R. D.  1999.  South American Coccinellidae(Coleoptera), Part VI: A systematic revision of theSouth American Diomini, new tribe (Scymninae).Annales Zoologici (Warsaw) 49 (Supplement 1): 1-219. Figure 8.  Heterodiomus brethesi, habitus.

Descriptions of the male of Heterodiomus marchali Brèthes and a new species of Chilean Heterodiomus Brèthes (Coleoptera: Coccinellidae: Scymninae: Diomini)

Descriptions of the male of Heterodiomus marchali Brèthes and a new species of Chilean Heterodiomus Brèthes (Coleoptera: Coccinellidae: Scymninae: Diomini)

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