Dorcasta birai, sp. nov.

(Figs 24–28)

Description. Integument mostly dark brown with some areas black; mouthparts reddish-brown.

Head. Frons moderately finely and abundantly punctate; with wide yellow, lateral pubescent band, from near antennal tubercles to apex of genae; with yellowish-white (more whitish depending on angle of light source), slender scale-like setae on wide central area, not obscuring integument; with a few long, dark erect setae interspersed on yellow pubescent band. Antennal tubercles smooth; with setae as on central area of frons, but shorter and sparser. Dorsal surface with sculpturing as on frons; with moderately wide pale yellow pubescent band from upper eye lobes to prothoracic margin, narrowly prolonged along upper eye lobes toward base of antennal tubercles; central area between pale yellow bands with yellowish-brown pubescence partially obscuring integument; with a few long, dark erect setae close to upper eye lobes. Area behind lower eye lobes with sculpturing as on frons; with moderately wide, oblique pale yellow pubescent band, from eye to prothoracic margin; remaining surface with yellowish-brown pubescence partially obscuring integument (more yellowish depending on angle of light source); with a few long, dark erect setae. Gena moderately coarsely, sparsely punctate; with yellowish-brown pubescence partially obscuring integument, except yellow pubescent band starting on frons, with sparse scale-like setae between yellow band and apex, apex glabrous; with a few long, dark erect setae. Distance between upper eye lobes 0.2 times length of scape; in frontal view, distance between lower eye lobes 0.6 times length of scape. Antennae in female 1.37 times elytral length, almost reaching elytral apex; in male, 1.48 times elytral length, slightly surpassing elytral apex. Scape and pedicel with sparse long, dark erect setae, about as long as to longer than diameter of segment; more abundant ventrally). Antennomeres III– XI with long (from about as long as diameter of antennal segment to almost 3 times longer), dark erect, setae ventrally, usually sparser on XI. Antennal formula (ratio) based on length of antennomere III (female/male): scape = 1.20/1.20; pedicel = 0.26/0.30; IV = 1.15/1.10; V = 1.00/1.00; VI = 0.85/0.85; VII = 0.79/0.75; VIII = 0.65/0.65; IX = 0.62/0.60; X = 0.53/0.50; XI = 0.62/0.65.

Thorax. Prothorax cylindrical, nearly parallel-sided. Pronotum coarsely, moderately abundantly punctate; with wide, longitudinal pale yellow pubescent band from base to apex on each side, and narrow pale yellow pubescent band centrally; with narrow, fragmented white pubescent band close to lateral yellow pubescent bands; remaining surface with yellowish-brown pubescence not obscuring integument; with sparse long, dark erect, setae throughout. Sides of prothorax coarsely, moderately sparsely punctate; with wide, longitudinal pale yellow pubescent band close to ventral side, margined with narrow, fragmented, white pubescent band; remaining surface with yellowish- brown pubescence partially obscuring integument, except area of epimeron close to prosternal process with white, scale-like setae, and short, narrow pale yellow pubescent band close to procoxal cavities and distal margin; prosternal process with minute scale-like setae and yellowish white setae centrally and distally. Ventral side of meso- and metathorax with white scale-like setae interspersed with short yellowish-white pubescent areas (especially on mesoventral process and center of metaventrite), except wider laterally (especially on mesanepisternum and mesepimeron), longitudinal yellow pubescent band, from mesanepisternum to apex of metaventrite, also covering base of metanepisternum. Mesoventrite and sides of metaventrite coarsely, sparsely punctate. Scutellum with pale yellow pubescence obscuring integument. Elytra. Coarsely, moderately abundantly punctate; apex triangularly projected laterally, slightly concave toward short sutural projection; with moderately abundant long, dark erect, setae throughout; pubescence as follows: three longitudinal pale yellow pubescent bands (two dorsal ones fused at apex), two dorsally (innermost starting at about apex of basal ninth; outermost from base to apex; both distinctly separate until near apex), another laterally, from base to apex; eight narrow, longitudinal white pubescent bands, one close to each side of yellow pubescent bands, one between dorsal and lateral yellow pubescent bands, another close to lateral margin; one narrow longitudinal band close to suture on basal quarter; remaining surface yellowish pubescent not obscuring integument; nearly all surface with minute yellowish and whitish scale-like setae. Legs. Metafemora moderately widened in female (Fig. 26), more so in male. Femora with yellowish-white pubescence, abundantly interspersed with minute yellowish scale-like setae; with sparse, long, dark erect setae.

Abdomen. Ventrites moderately finely, sparsely punctate; with yellow pubescence laterally, connected along distal margin of each ventrite, and minute whitish scale-like setae on remaining surface.

Dimensions (mm), holotype female/ paratype female. Total length, 9.60/9.10; prothoracic length, 1.80/1.65; basal prothoracic width, 1.45/1.40; distal prothoracic width, 1.40/1.40; greatest prothoracic width, 1.50/1.45; humeral width, 1.85/1.80; elytral length, 6.85/6.35.

Type material. Holotype female from BRAZIL, Goiás: Aruan (Rio Araguaia), X.1960, no collector indicated (former Diringshofen collection) (MZSP). Paratype male, same data as holotype except V.1960 (MZSP).

Remarks. Dorcasta birai sp. nov. is similar to D. crassicornis (Figs 18–23, 35–37), but differs by the presence of minute scale-like setae on nearly the entire body (absent in D. crassicornis), and by the frons without dense pubescence centrally (Fig. 28) (densely pubescent in D. crassicornis).

Etymology. The new species is named after the late Ubirajara Ribeiro Martins de Souza (Bira).