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).

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.