Osoriellus solidus ( SHARP, 1876 ) Irmler, 2014

Irmler, Ulrich, 2014, The Neotropical species of the genus Osoriellus FAGEL, 1959 (Coleoptera: Staphylinidae: Osoriinae), Beiträge Zur Entomologie = Contributions to Entomology 64 (2), pp. 231-354 : 256-257

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.

Figures

Fig. 32-37: Osoriellus-guiananus-group: Osoriellus guiananus (32), O. breviceps (33), O. solidus (34), O. macrops (35), O. melancholicus (36), O. diversus (37); antenna (A), protibia (B), aedeagus in lateral aspect (C); scale bar: 0.1 mm.