Liogenys vicina Frey, 1969 Figs. 22; 26. Liogenys vicinus Frey, 1969: 62, 51 (key); Krajčík 2012: 145 (checklist); Cherman et al. 2017: 5 (generic history). Liogenys vicina: Evans 2003: 215 (checklist); Evans & Smith 2009: 183 (checklist); Cherman et al. 2017: 20 (natural history). Type material. Liogenys vicinus male holotype (USNM): [white handwritten] “Formosa / Clorinda / 8.XI.950. Daguerre”, [red, typeset and handwritten] “Type No / 74010 / USNM”, [red typeset] “TYPUS”, [white, typeset and handwritten] “ Liogenys / vicinus / n.sp. / Type / det. G Frey, 1968”, [pink typeset] “Property / USNM”, [white typeset] “Loan from / USNMNH / 2065060”, genitalia mounted. Paratypes (2): One female (NHMB) [white handwritten] “Formosa / P. Pilcomayo”, [white typeset] “♀”, [red typeset] “PARATYPE”, [white, typeset and handwritten] “ Liogenys / vicinus / n.sp. / det. G. Frey, 1968”. One male (NHMB) [white typeset] “Argentina / Formosa / Cindad XII.1949 / A. Martinez leg.”, [red typeset] “ PARATYPE ”, [white, typeset and handwritten] “ Liogenys / vicinus / n.sp. / det. G. Frey, 1968”, genitalia mounted. Non-type material (9). ARGENTINA. Formosa: Laguna Yema: Centro de Validación-(CEDEVA), barrio CEDEVA, 24º16’03’’S 61º14’54’’W, 163 m, 14.XII.2008, F.C. Ocampo, G. San Blas, & F. Campon, 1 male (IADIZA); Reserva de Biósfera Teuquito, Ruta Provincial 37, 1 km S “Canal”, 24º21’20,95’’S 61º18’55,23’’W, 11.XII.2008, 1 male and 1 female (IADIZA); Chaco: Fuerte Esperanza, XI.1978, A. Martínez & Fritz, 2 males and 2 females (CMNC); Santiago del Estero: without locality, II.1960, without collector, 1 male and 1 female (IADIZA). Diagnosis. Length 10.8–11.9 mm; width: 4.8–5.9 mm. Body elongate, brown to dark brown, shiny; coarsely punctate (Fig. 22A); clypeal emargination deep but not reaching the base of the teeth, rounded and narrowed; clypeal lateral margin strongly convex and produced, forming a tooth-like projection; pronotal posterior corners subangulate to rounded (Fig. 22B); antennae with 10 antennomeres; first two pair of elytral ridges equally defined and more noticeable than the other two; basal apophysis of metacoxa produced; metafemur with bristles, sometimes abundantly; metatibia not carinate along the inner margin; pygidium convex, wider than it is long; pygidial width wider than the distance between spiracles of propygidium, disc with bristles throughout, erect bristles (Fig. 22D); in males protarsomeres and mesotarsomeres strongly enlarged, metatarsomeres slightly enlarged; parameres strongly expanded at the midline and abruptly narrowed at the apex (Fig. 22E, F); parameres strongly convex in lateral view (Fig. 22G). Geographical distribution. ARGENTINA (Formosa, Chaco, Santiago del Estero). Remarks. Liogenys vicina resembles the sympatric L. latitarsis (Fig. 10), and these similarities difficult their identification. Liogenys vicina differs from L. latitarsis (in parenthesis) in the punctures on pronotum and elytra coarser; clypeal emargination slightly narrower, lateral margins of pronotum slightly rounder, elytral inner ridges evenly elevated (sometimes the second ridge less elevated), metafemur more with bristles; and in the shape of parameres inflated basally and abruptly narrowed at the apex (not inflated basally and apical constriction absent).

Published as part of Cherman, Mariana Alejandra, Basílio, Daniel Silva, Mise, Kleber Makoto, Frisch, Johannes & Almeida, Lúcia Massutti De, 2021, Liogenys Guérin-Méneville, 1831 (Coleoptera: Scarabaeidae: Melolonthinae Diplotaxini) from the Chacoan Province and its boundaries: taxonomic overview with four new species, pp. 1-59 in Zootaxa 4938 (1) on page 50, DOI: 10.11646/zootaxa.4938.1.1, http://zenodo.org/record/4561258