Liogenys unicolor Evans, 2003

Cherman, Mariana Alejandra, Mise, Kleber Makoto, Moron †, Miguel Angel, Vaz-de-Mello, Fernando Z. & Almeida, Lucia Massutti de, 2017, A taxonomic revision of Liogenys occurring in Brazil with an interactive key and remarks on New World Diplotaxini (Coleoptera, Melolonthidae), ZooKeys 699, pp. 1-120 : 74-75

Liogenys unicolor Evans, 2003 Figs 78, 93

Hilarianus concolor Blanchard, 1851: 170 (orig. desc.); Lacordaire 1856: 270 (genus red.); Harold 1869a: 1141 (check.); Dalla Torre 1913: 319 (check.); Blackwelder 1944: 228 (check.).

Liogenys concolor : Frey 1974: 331 (not Blanchard 1851: 167) (n. comb.).

Liogenys unicolor Evans, 2003: 215 (replacement name); Evans and Smith 2005: 178 (check.); Evans and Smith 2009: 183 (check.)

Type material.

Hilarianus concolor syntype (MNHN): [white handwritten] "Capite/des Mines", [light green printed] “MUSÉUM PÁRIS / [handwritten] Caple/des/Mines", [red printed] “SYNTYPE”, [green handwritten] " H. concolor / Cat Mus/ Brésil / M. A. St Hilaire". This type is here designated the lectotype [white, outlined in red, printed] "LECTOTYPE/ Hilarianus concolor /Blanchard, 1851/ des. M. A. Cherman 2014".

Non-type material.

BRAZIL. MG: Cruzeiro, EPDA-Peti, 13/X/1998, Vasconcellos col., 1 ex. (CEMT); MT: 1948, Kolug and Carvalho, 1 ex. (MNRJ); without locality, date and collector, 1 ex. (ZMHB).

Diagnosis.

Body reddish brown; elongate, slightly wider on the posterior third; elytra uniform reddish brown as the pronotum; frons swollen, longer than clypeus; clypeus weakly emarginate; outer sides of anterior teeth follow the lateral margin of clypeus; canthus exceeding the outer margin of the eye; sensorial area not forming a fovea; pronotal maximum length equal to tarsomeres I, II and III together; anterior margin of pronotum apparently concave, pronotal anterior corners bent frontwards; basal apophysis of metacoxa not produced; inner margin of metatibia not carinated; in males pro- and mesotarsomeres I to IV weakly enlarged; pygidium convex, glabrous; parameres narrowed at the transverse midline and subapically; divergent; apex truncated and strongly curved downwards (Fig. 78F).

Redescription.

Length: 9.0-9.4 mm; width 5.0-5.1 mm. Reddish brown. Head: distance between eyes nearly three times wider than one eye; frons somewhat swollen, longer than clypeus; clypeal emargination weak, sub-angled, shallow and narrow; outer sides of anterior teeth follow the lateral margin of clypeus; lateral margin straight; canthus exceeding the outer margin of the eye; distal maxillary palpomere, maximum width less than twice width of apex; sensorial area not reaching the transverse midline of the palpomere and not forming a fovea; labium transversely carinated, as wide as it is long; antenna 10-articulated, lamellae lighter in color than flagellum and equal in length. Thorax: anterior margin of pronotum slightly produced medially; maximum length of pronotum equal to tarsomeres I, II and III together; disc glabrous, punctures very sparse; pronotal anterior corners bent frontwards; pronotal posterior corners rounded; pronotal convexity on lateral margins weak; proepisternum with short bristles; mesepisternum scaly; sides of metasternum with sparse long and short bristles; distance between meso- and metacoxae up to twice longer than the metacoxa; scutellum ogival, punctured only at the base. Elytra: shiny, glabrous, uniform reddish brown; elytra more than three times longer than the pronotum; elytral suture and elytron unicolored, distinctly elevated; four elytral ridges barely noticeable, the outer one slightly more noticeable than the others. Legs: procoxa, sparse scales on infra-carinal and outer surface; punctures visible at 12 × magnification; three protibial teeth, middle and apical equal in size, the three teeth equally spaced; protibial inner apical spur present; mesofemural disc smooth, with a row of short bristles on the anterior and posterior margins; mesotibia cylindrical in cross section; disc finely sculptured; two mesotibial transverse carinae, the apical one complete; basal apophysis of metacoxa not produced; inner margin of metatibia not carinated or produced on apex; inner surface setose; metatibial disc coarsely sculptured; a complete metatibial transverse carina present posteriorly; metatibial apical spurs of different lengths, the longest equal in length to the diameter of the tibial apex; pro- and mesotarsomeres I to IV weakly enlarged, protarsomeres as wide as the mesotarsomeres, slightly wider than the metatarsi; basal metatarsomere up to one-half the length of tarsomere II and wider; claw bifid, symmetrical, superior tooth longer and as wide as the inferior; distance between teeth longer than the inferior tooth. Abdomen: Ventrites bristled on disc and scaly on sides; propygidium slightly visible, pygidium convex, sub-trapezoidal, wide; pygidial width not exceeding distance between spiracles of propygidium; pygidial disc glabrous; pygidial apex rounded. Parameres: width of basal region equal to the parameres together at its maximum width, parameral split at the third portion almost the midline, narrowed at this point and also subapically; inner margins of parameres divergent; apex truncated (Fig. 78F). In lateral view parameres convex, apex strongly curved downwards (Fig. 78G).

Type locality.

BRAZIL. "Capit.e des Mines" [Minas Gerais state].

Geographical distribution.

BRAZIL (MT, MG).

Remarks.

Liogenys unicolor resembles L. macropelma and shares with this species less frequent Liogenys characters, as the sensorial area of the maxillar distal palpomere flat, not forming a fovea; pronotum as long as protarsomeres I, II e III together, and pro- and mesotarsi weakly enlarged in males. Despite this, these species are not closely related according to Cherman et al. (2016) and instead, it is more closely to Liogenys sinuaticeps , which, in addition to the flat palpomere of the maxilla, shares features as the basal apophysis of metacoxa not produced and the pygidium glabrous. Liogenys unicolor holotype has 10-articulated antenna and a weakly but still emarginate clypeus, disagreeing with Blanchard (1851) who described the species with a 9-articulated antenna and rounded clypeus instead. Females remain unknown.