Liogenys Guérin-Méneville, 1831 (Coleoptera: Scarabaeidae: Melolonthinae Diplotaxini) from the Chacoan Province and its boundaries: taxonomic overview with four new species Author Cherman, Mariana Alejandra Laboratório de Sistemática e Bioecologia de Coleoptera, Departamento de Zoologia, Universidade Federal do Paraná, Caixa Postal 19020, 81531 - 980, Curitiba, Paraná, Brazil. & Laboratório de Scarabaeoidologia, Departamento de Biologia e Zoologia, Instituto de Biociências, Universidade Federal de Mato Grosso, 78060 - 900, Cuiabá, Mato Grosso, Brazil. Author Basílio, Daniel Silva 0000-0003-3556-5880 Laboratório de Sistemática e Bioecologia de Coleoptera, Departamento de Zoologia, Universidade Federal do Paraná, Caixa Postal 19020, 81531 - 980, Curitiba, Paraná, Brazil. & basilio. dsb @ gmail. com; https: // orcid. org / 0000 - 0003 - 3556 - 5880 basilio.dsb@gmail.com Author Mise, Kleber Makoto 0000-0003-4391-9589 Laboratório de Sistemática e Bioecologia de Coleoptera, Departamento de Zoologia, Universidade Federal do Paraná, Caixa Postal 19020, 81531 - 980, Curitiba, Paraná, Brazil. & klebermise @ yahoo. com. br; https: // orcid. org / 0000 - 0003 - 4391 - 9589 klebermise@yahoo.com.br Author Frisch, Johannes Museum für Naturkunde Berlin, Invalidenstrasse 43, 10115 Berlin, Germany. Author Almeida, Lúcia Massutti De 0000-0003-4277-711X Laboratório de Sistemática e Bioecologia de Coleoptera, Departamento de Zoologia, Universidade Federal do Paraná, Caixa Postal 19020, 81531 - 980, Curitiba, Paraná, Brazil. & lalmeida @ ufpr. br; https: // orcid. org / 0000 - 0003 - 4277 - 711 X lalmeida@ufpr.br text Zootaxa 2021 2021-02-25 4938 1 1 59 journal article 7835 10.11646/zootaxa.4938.1.1 045b347a-4a5b-474f-b69f-1cd3fedf7678 1175-5326 4561258 074E95CD-E7C0-4098-93F0-70DE03CAD0D0 Liogenys rugosicollis Frey, 1969 Figs. 20 ; 24 . Liogenys rugosicollis Frey, 1969: 51 , 63; Evans 2003: 214 (checklist); Evans & Smith 2009: 182 (checklist); Krajčík 2012: 145 (checklist); Cherman et al. 2017: 5 (generic history). Type material . Liogenys rugosicollis male holotype labeled ( USNM ): [white handwritten] “ Formosa / P. P. Icomajo [Puerto Pilcomayo] / Argentinien ”, [red typeset] “TYPE”, [white, typeset and handwritten] “ Liogenys / rugosi- / collis n sp / Type / det. G Frey , 1968”, [pink handwritten] “Cartwright / Smithson”, [red, typeset and handwritten] “Type Nº / 74009 / USNM”, genitalia mounted. Paratypes (1) ( NHMB ): [white handwritten] “ Formosa / P.P. Icomayo [Puerto Pilcomayo] / XII.950—Daguerre”, [orange, round, empty label], [pink typeset] “Property / USNM”, [red typeset] “ PARATYPE ”, [white, typeset and handwritten] “ Liogenys / rugosi / collis / n sp. / det. G. Frey , 1968”, genitalia mounted . Non-type material (2). ARGENTINA . Salta : Chaco Occidental , 100 km NE Los Colorados [ 20 km NE Cafayate ], I.1993 , M. McLaqughlin & B. Bestelmeyer , 1 female ( UNSM ) ; Santiago del Estero : Ciudad de Santiago del Estero , XII.1939 , J. Bosq , 1 female ( MZUC ) . Diagnosis . Length: 11.0–12.0 mm; width: 5.5–6.1 mm . Body and elytra purplish brown, elongate; pronotum sometimes darker than elytra, disc roughly punctate, punctures dense ( Fig. 20A ); frons somewhat swollen and depressed medially, especially in females; clypeal emargination deep, rounded and narrow, slightly wider in males; outer sides of anterior teeth parallel; clypeal lateral margin with a sharp tooth-like projection, stronger in females, forming an acute angle between this projection and the anterior teeth, angle narrower in females; antennae with 10 antennomeres; pronotal posterior corners sharp, in obtuse angle ( Fig. 20B ); hypomere, mesepisternum, sides of metaventrite, metacoxae and ventrites beneath the elytra scaly abundantly ( Fig. 20C ); mesotibia cylindrical in cross section; in males mesotibial and metatibial inner margin strongly concave; in females only on mesotibial inner margin; two transverse carinae present posteriorly, the apical one complete; pygidium flat; subtrapezoidal, apex subrounded; propygidium and pygidial disc densely scaly throughout, except on apex, with long, erect bristles ( Fig. 20D ); in males, metatibial inner margin strongly concave, carinate on apical portion; protarsomere II elongate, mesotarsi weakly enlarged; parameres strongly concave on inner margin and convergent apically; parameral split at 2/3; apex harpoon-shaped, parameres five times longer than the apex ( Fig. 20E ); parameres in lateral view convex, not coplanar ( Fig. 20F ). FIGURE 20. Liogenys rugosicollis Frey, 1969 male views: A) dorsal, B) head and pronotum, C) lateral, D) pygidium, and parameres in views: E) dorsal, and F) lateral. Type locality . ARGENTINA , Formosa , Puerto Pilcomayo . Geographical distribution . ARGENTINA ( Salta , Formosa , Santiago del Estero ) . Remarks . Liogenys rugosicollis resembles L. densata ( Fig. 4 ) in the body shape, size, and color and in the white-scaled vestiture covering the propygidium and most of the pygidium; and in males, the metatibial inner margin concave, although stronger in L. rugosicollis . It differs from L. densata (in parenthesis) in the lateral margin of clypeus with a sharp tooth-like projection, and acute angle between this projection and the anterior teeth (blunt projection, obtuse angle or angle absent); pronotal disc rugose, very coarsely punctate (finely punctate); mesotibiae and metatibiae shorter; pygidium narrower; in males the metatibial inner margin strongly concave (slightly concave); the inner margin of metatibia carinate only apically (weakly carinate along the entire margin); and mesotarsi slightly more enlarged. The parameres look quite alike except in their curvature in lateral view; the basal region slightly longer and the apex slightly shorter. Frey (1969) mentioned that there is only one primary type of Liogenys rugosicollis , reportedly deposited at the USNM, but we found this paratype at the NHMB.