Osoriellus setosus n. sp.

(Figs 22B, C, 27E)

Type material: Holotype, male: Ecuador: Napo, 81 km NE Baeza, 3 km SW Reventador, 5300 ft elevation, litter, 28., 29.10.1988, leg. L. Herman (AMNH).

Paratypes: Ecuador: Napo Prov. 5 km S. Baeza, on Road to Tena, 1700 m elevation, under rocks and logs, 2 males, 28.4.1990, leg. C. Carlton & R. Adrave (KNHM) ; Napo Prov. 81 km NE Baeza, 3 km SW Reventador, 5300 ft elevation, litter, 2 males, 2 females, 28., 29.10.1988, leg. L. Herman (AMNH, UIC) ; Prov . Napo, Cosanga (77°51.52'W, 0°34.45'S), 1950 m elevation, beating of forest vegetation, female, 25.11.2009, leg. L. Sekerka & K. Stajerova (BMNH) .

Diagnosis: Among the O.- hirtulus -group, O. setosus can be easily identified by the symmetric aedeagus, similar as in O. setifer . The species is larger than O. setulosus and O. pubicollis, but smaller than O. hirtulus . Compared to O. pubicollis, the pronotum is more triangular. It resembles O. pubescens in shape and size. However, the aedeagus of O. pubescens is asymmetric like in O. setulosus and O. pubicollis .

Description: Length: 6.6 mm. Colouration: Brown; pronotum and abdominal segments III-VI lighter brown; legs and antennae light brown.

Head: 1.11 mm long, 1.44 mm wide; eyes moderately large; not prominent; as long as temples; sides of fore-head emarginate; anterior edge of clypeus even; setiferous punctation irregularly dense; on fore-head sparser than close to neck; close to neck, interstices between punctures one fourth as wide as diameter of punctures; small area on central posterior vertex and at base of antennae impunctate; on supraocular area punctures partly granulate; netlike microsculpture weak; surface shiny.

Antennae slightly longer than head; second antennomere globular; as long as third; following antennomeres approximately quadrate.

Pronotum: 1.36 mm long, 1.55 mm wide; widest at anterior angles; evenly convergent to widely rounded posterior angles; anterior angles produced to short acute teeth; lateral margin fine; finer at anterior angles than at posterior angles; setiferous punctation deep and dense; interstices between punctures half as wide as diameter of punctures; moderately wide midline impunctate; without microsculpture; surface shiny.

Protibia: 0.81 mm long, 0.24 mm wide; 8 spines at outer edge; apical four spines inserted on short teeth; WLR: 0.7; in posterior aspect, comb of inner emargination visible throughout its total length; posterior face with moderately dense setation; on average, setae slightly longer than half of protibial width.

Aedeagus symmetric; apical lobe triangular; smoothly curved to acute angle.

Etymology: The specific name refers to the dense setiferous punctation of the total body.