Osoriellus solidus (SHARP, 1876) new combination (Figs 34 A-C, 41B) Osorius solidus SHARP, 1876: 384 Type material examined: Brazil: Amazonas, São Paulo de Olivença (holotype partly destroyed in BMNH). shows no traces of microsculpture. The surface is totally polished and shiny. Description: Length: 7.2 mm. Colouration: Black; legs and antennae dark brown. Head: 0.91 mm long, 1.33 mm wide; eyes slightly prominent; nearly 1.5 times as long as temples; fore-head narrowed to anterior edge in slight concave curve; ante- Key to the species 1. Anterior edge of clypeus even, sides of pronotum evenly narrowed in smooth convex curve or shortly sinuate in front of posterior angles; posterior angles obtusely rounded. ....................................................................................... 2 - Anterior edge of clypeus emarginate, sides of pronotum shortly sinuate in front of posterior angles; posterior angles approximately rectangular. ................................................................................................................................................. 6 2. Large species of at least 7.0 mm length, eyes distinctly prominent, posterior angles of pronotum weakly developed.. ......................................................................................................................................................................................................... 5 - Smaller species of 6.5 mm length or smaller; eyes less prominent. .............................................................................. 3 3. Pronotum with distinct microsculpture and without micro-punctation, sides of pronotum straight with obtuse posterior angles. ................................................................................................................. O. breviceps (NOTMAN, 1925) - Pronotum without or with weak microsculpture and with micropunctation, sides of pronotum convex or slightly sinuate in front of posterior angles. .................................................................................................................................. 4 4. Pronotum without microsculpture, surface polished and shiny, sides not sinuate in front of posterior angles. ...... ..................................................................................................................................................................... O. diversus n. sp. - Pronotum with weak microsculpture, surface moderately shiny, lateral margin widened in posterior half and sinuate in front of posterior angles. ............................................................................................................. O. silvaticus n. sp. 5. Pronotum with remains of weak isodiametric microsculpture, surface shiny. ................................ O. macrops n. sp. - Pronotum without traces of microsculpture, only with micro-punctation; surface polished and shiny. ................... ........................................................................................................................................................ O. solidus (SHARP, 1876) 6. Colouration light brown, pronotum with dense elongate punctation, without micro-punctation. ............................ .......................................................................................................................................................... O. longipunctatus n. sp. - Colouration dark brown or black, pronotum with moderately dense punctation and with micro-punctation. ... 7 7. Smaller species of less than 5.5 mm length, pronotum without microsculpture, surface polished and shiny. ......... ........................................................................................................................................ O. guiananus (BERNHAUER, 1934) - Larger species of at least 6.0 mm length, pronotum with distinct microsculpture; surface matt or moderately shiny, not polished. .................................................................................................................................... O. melancholicus n. sp. Further material examined: French Guiana: Roura, 39.4 km SSE (52°08.26'W, 4°32.43'N), 270 m elevation, collected by flight intercept trap, 6 males, 5 females 29.5.- 10.6.1997, 23.- 24.5.1997, leg. J. Ashe, R. Brooks (KNHM, UIC); 27.4 km SSE (52°13.25'W, 4°44.20'N), 280 m elevation, 4 male, 4 female, 25.- 26.5.1997, 10.6.1997, leg. J. Ashe, R. Brooks (KNHM, UIC); 18.4 km SSE (52°13.25'W, 4°36.38'N), 240 m elevation, 2 females, 29.5.- 10.6., leg. J. Ashe, R. Brooks (KNHM). Diagnosis: O. solidus mostly resembles O. macrops in size, shape of pronotum and abdominal microsculpture. In contrast to O. macrops, the pronotum of O. solidus rior edge of clypeus even with slightly produced angles; punctures large and without setae; punctures mostly elongate and partly coriaceous; clypeus densely punctate; central vertex and area at base of antennae impunctate; supraocular area very densely and coriaceously punctate; vertex more sparsely punctate than clypeus und supraocular area; four setae on clypeus, four in transverse row close to neck, and few supraocular and preocular setae; without microsculpture; surface moderately shiny. Antennae slightly shorter than head and half of pronotum combined; second antennomere oval; longer than wide; third conical and as long as second; following antennomeres increasing in width; antennomeres four and five longer than wide; tenth antennomere nearly quadrate. Pronotum: 1.42 mm long, 1.55 mm wide; widest shortly behind anterior angles; evenly convergent to posterior angles in convex curve; lateral margin fine and slightly widened to posterior angles; in dorsal aspect, not visible close to anterior angles; punctation moderately large and dense; punctures without setae; smaller than on head and not elongate; on average, interstices between punctures between 1.5 times and two times as wide as diameter of punctures; narrow midline in posterior part impunctate; between normal coarse punctures with sparse micro-punctation; without microsculpture; surface shiny. Elytra: 1.67 mm long, 1.85 mm wide; widest in posterior third; coriaceous ground-sculpture indistinct; punctures without setae and, on average, deeper and larger than on pronotum; surface moderately shiny. Abdomen on tergites III to VI sparsely punctate and without microsculpture; tergites VII and VIII with dense elongate punctures similar as on head; with remains of fine elongate microsculpture. Protibia: 0.79 mm long, 0.24 mm wide; slender; with 8 spines at outer edge; apical three spines inserted on long teeth; WLR: 0.48; in posterior aspect, inner emargination with comb visible throughout its total length; posterior face sparsely covered by long yellow setae. Aedeagus with long slender apical lobe; apical lobe longer than basal lobe and smoothly curved to obtuse apex; row of sensillae on lateral face and on inner edge of apical lobe.

Published as part of Irmler, Ulrich, 2014, The Neotropical species of the genus Osoriellus FAGEL, 1959 (Coleoptera: Staphylinidae: Osoriinae), pp. 231-354 in Beiträge Zur Entomologie = Contributions to Entomology 64 (2) on pages 256-257, DOI: 10.21248/contrib.entomol.64.2.231-354, http://zenodo.org/record/5461706