Lesbates chavesi sp. nov.

(Figs. 1 – 7)

Description. Male. Integument entirely black, smooth and with no bristles. Habitus as in Fig. 7.

Head. Frons elongated, densely punctate with shallow spots. Genae elongate; lower eye lobes small, not projecting beyond middle of genae (Fig. 2). Inner edge of antenna tubercle prominent, projecting like a horn. Discrete, clavate apex of scape. Long antennae, twice total body length, projecting beyond elytral apices from antennomere VI; long antennomere III, approximately 1.5 times length of scape; antennomeres IV to X slightly shorter than III; XI slightly longer than X. Antennomeres black.

Thorax. Prothorax laterally without tubercles or spines; rough pronotal disk with shallow punctation and two discrete lateral elevations. Glabrous elytra with shallow punctation, denser on basal third, and with no central, basal elevations; projecting humeri with distinct crests; rounded and unarmed apices. Profemora striated on dorsal and ventral surfaces. Protibiae notched on inner surface, near apex. Discrete tuft of yellow bristles near middle of mesotibia.

Female. Antennae shorter than in males, projecting beyond elytral apices at antennomere X; antennomere length decreasing apically from III. Central longitudinal sulcus along entire length of urosternite V (Fig. 4). Coloration of basal half of antennomeres IV-XI varies from black to reddish-brown (Fig. 6).

Remarks. This species resembles Lesbates axillaris because of its black integument. It differs from L. axillaris in the following characteristics: absence of pubescence on the head, thorax and elytra; lower eye lobes small, distinctly shorter than genae; inner edge of antenna tubercles prominent, projecting like horns; antennomeres black; scape glabrous. In L. axillaris: frons dark brown with two small, whitish spots between lower eye lobes; pronotum and elytra with large, distinct, whitish maculae; lower eye lobes large, about as tall as genae; inner edge of antenna tubercles with discrete projection; antennomeres III – XI yellow with black apices; clavate scape with tuft of bristles on the ventral surface.

Etymology. We name this species as a tribute to Leonardo Chaves Gomes, collector of the specimens, who generously made them available for this study.

Measurements, in mm. Holotype male, total length, 16.6; prothorax length, 3.4; prothorax width at its widest point, 5.0; elytral length, 10.8; humeral width, 7.5. Paratypes, male/female respectively: total length: 16.9–16.6 / 18.8–14, prothorax length: 3.29–3.15 / 3.52–2.59, prothorax width at its widest point: 5.15–4.46 / 5.48–3.9, elytral length: 11.62–11.29 / 13.06–9.84, humeral width: 7.92–6.95 / 8.4–6.26.

Type material. Holotype, male, BRAZIL, Rio de Janeiro, Arraial do Cabo, Morro da Cabocla, 22°57'41.59"S 42° 0'54.69"W, 150 m a.s.l., 07.i.2018, L.C. Gomes, R.M. Koike & R.C. Barros leg (Fig. 3). Paratypes (5): same locality, female, 12.i.2027 L. C. Gomes & A.G.S. Lopez leg.; female, 14.i.2018 L.C. Gomes & A.G.S. Lopez leg.; female, 28/ 29.i.2018 L.C. Gomes & A.G.S. Lopez leg.; male, 12.i.2017, L.C. Gomes & A.G.S. Lopez leg.; male, 10.i.2018, R.M. Koike & R.C. Barros & L.C. Gomes leg.