The Neotropical species of the genus Osoriellus FAGEL, 1959 (Coleoptera: Staphylinidae: Osoriinae) Author Irmler, Ulrich text Beiträge Zur Entomologie = Contributions to Entomology 2014 2014-12-15 64 2 231 354 https://www.contributions-to-entomology.org/article/view/1859 journal article 2515 10.21248/contrib.entomol.64.2.231-354 5df8bd34-9c04-4499-afe0-018387e11ffb 0005-805X 5461706 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.