Acabyara aruama, new species

Fig. 1

Etymology. The epithet is from the indigenous Tupi language, meaning pretty.

Female. Head with frons and genae black, ventral surface orangish. Antennae and legs black. Prothorax and scutellum orangish. Meso­ and mesosternum orangish to brownish. Urosternites dark brown. Elytra black, sometimes with humeri and base near suture orangish; each elytron with three oblique vittae formed by dark pilosity: one at humerus, the other beginning near scutellum and extended at lateral margin slightly beyond middle, and the third beginning near suture in front of middle, then obliquely extending backwards to behind middle where it bifurcates in two rami, both reaching the apical fifth, the inner ramus turning towards the suture.

Frons and antennal tubercles finely corrugate, pubescence reddish­brown weakly conspicuous. Posterior region of head impunctate, with orangish pubescence. Mandibles shiny, moderately densely rugose punctate.

Antennae as long as or little longer than body. Scape barely depressed at base, finely corrugate, with sparse, brownish pilosity. Segments 3 to 11 depressed, finely, densely punctate, moderately densely pubescent; segment 3 with long, moderately dense hairs beneath, 4 to 6 with sparse, long hairs beneath, even almost as long as the respective segments; apex of segments 7 to 10 and contriction of segment 11 with hairs as long as or longer than the segments. Segments 3 to 5 unarmed at outer apex, 6 to 10 angulate at outer and inner apex. Scape longest; segment 3 about 1/3 longer than following that are subequal in length.

Prothorax about 1/3 broader than long, rounded at sides, slightly sinuous behind middle, posterior angles protruded, anterior angles rounded. As wide in middle as across the base which is almost as wide as humeri and about 1/3 wider than the apex. Pronotum and sides of prothorax opaque, impunctate, with yellowish, hardly visible pubescence, and scatered suberect setae more evident at sides of prothorax. Prosternum impunctate, sparsely yellowish pubescent. Mesosternum, metasternum and urosternites finely corrugate, clothed with whitish pubescence denser on urosternites. Fifth urosternite attenuate to the truncate apex.

Scutellum small, rounded at apex, clothed with whitish pubescence. Elytra, except where the integument is orangish, densely clothed with grayish­white pubescence obscuring integument. Apex shortly emarginate near suture.

Femora finely corrugate clothed with whitish pubescence intermingled by coarser, shallow, sparse punctures bearing brown setae. Metafemora reaching apex of third urosternite. Tibiae cylindrical, depressed, sparsely setose, without pubescence.

Measurements, in mm, female. Total length 12.2–9.8; prothorax length 2.0–1.5; prtothorax width at middle and base 3.0–2.3; elytra length 9.2–7.5; humeral width 3.3–2.5.

Type material. Holotype female (MNRJ), BRAZIL, Rondonia, Ariquemes, VIII.1980 (B. Silva). Paratypes: COLOMBIA, Amazonas, Mocágua (PNN Amacayacu, 3º 23’S 70º 6’W, 150 m, Malaise), 1 female, 31.VII–7.VIII.2000 (A. Parente) (MZSP); BRAZIL, Amazonas, Tefé, 1 female IX.1963 (R. Carvalho) (MNRJ), 1 female (10 km W), 23.II.1981 (G. Ekis) (MZSP).