Gabrius macer, Hromádka, 2011

Hromádka, L., 2011, Revision of the genus Gabrius STEPHENS 1829 from Madagascar and adjoining Islands (Coleoptera: Staphylinidae: Philonthina), Linzer biologische Beiträge 43 (2), pp. 1377-1397 : 1386

Gabrius macer JARRIGE 1990 (Figs 26-28)

T y p e m a t e r i a l e x a m i n e d Holotype: ″ La Réunion: Plaine des Cafres , Notre Dame de la paix, 1700 m, 28.xii.1971, // Gabrius macer sp.n. J. C. Lecoq, 1987 [white oblong label handwritten] Brachyptère, Museum Paris ex collection J. Jarrige ″ ( MNHN).

R e d e s c r i p t i o n: Body length 5.2 mm, length of fore body (to end of elytra) 2.6 mm. Head and pronotum black, elytra and abdomen black-brown, posterior margin of all tergites and paratergites narrowly brown-yellow. Maxillary and labial palpi brownyellow, mandibles brown with apex brown-yellow, antennomeres 1-2 and base of antennomere 3 brown-yellow, remaining antennomeres black-brown, legs yellow-brown.

Head slender, slightly longer than wide (ratio 17: 15), distinctly narrowed posteriorly, clypeus with a shallow oblong depression medially. Between eyes 4 punctures, distance between medial punctures 3 times as large as distance between lateral and medial puncture, medial punctures slightly shifted anteriorly. Posterior angles indistinct, bearing 2 long black bristles. Eyes much shorter than temples (ratio 3: 10), temporal area with several scattered punctures. Surface with microsculpture consisting of transverse waves.

Antennae slender and long, reaching posterior fifth of pronotum when reclined. Antennomeres 1-4 and 11 longer than wide, antennomere 1 longer than antennomere 11, antennomere 2 longer than antennomere 3.

Pronotum longer than wide (ratio 21: 17), distinctly narrowed anteriorly, anterior angles indistinct, bearing several short bristles, posterior angles markedly rounded. Each dorsal row with 6 approximately equidistant punctures, each sublateral row with 2 punctures, puncture 1 situated behind level of puncture 3 in dorsal row, puncture 2 slightly shifted to the lateral margin. Surface with microsculpture similar to that on head.

Scutellum only with several very fine punctures, surface with microsculture similar to that on head; setation fine.

Elytra longer than wide (ratio 22: 20), parallel-sided, anterior angles bearing 2 long bristles, punctation coarse and dense, diameter of punctures larger than eye-facets, separated smaller than 1 puncture diameter in transverse direction. Surface without microsculpture; setation gray.

Legs. Metatibia as long as metatarsus, metatarsomere 1 slightly shorter than metatarsomere 5, almost as long as metatarsomeres 2-3 combined.

Abdomen very gradually narrowed posteriorly. Punctation at base of all visible tergites finer than that on elytra, becoming finer and sparser towards posterior margin of each tergite. Surface lacks microsculpture; setation similar to that on elytra.¨

C o m p a r a t i v e n o t e s G macer differs from similar G. gomyi by the wider and longer head, shorter elytra, from G rabigoides by the longer eyes, slightly longer antennae and from the both latter species by the different shape of the aedeagus.

D i s t r i b u t i o n: Réunion ( HERMAN 2001).