Gabrius quadriceps JARRIGE 1978

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 : 1389-1390

Gabrius quadriceps JARRIGE 1978 (Figs 35-37)

T y p e m a t e r i a l e x a m i n e d Holotype: ″Andringitra Est, Anjavidilava 2000 m, 18.xii.1971, // Gabrius quadriceps J. Jarrige , det., 1971, Holotype, [white oblong label handwritten], Mueum Paris , Madagascar Centre mission C.N. R.S. R.C.P. no 225″ ( MNHN).

R e d e s c r i p t i o n: Body length 6.7 mm, length of fore body (to end of elytra) 3.3 mm. Head and pronotum black, elytra and abdomen black-brown, posterior margin of tergites narrowly and all paratergites brown-yellow, maxillary and labial palpi brownyellow, mandibles brown with apex brown-yellow. Legs and antennomeres 1-3 yellowbrown, remaining antennomeres dark brown.

Head slightly longer than wide (ratio 26: 24), distinctly narrowed posteriorly. Posterior angles indisting, bearing 2 long black bristles. Eyes much shorter than temples (ratio 6: 12), between eyes 4 punctures, distance between medial punctures about 4 times as large as distance between medial and lateral puncture, medial punctures slightly shifted anteriorly. Temporal area with scattered punctures, surface lacks microsculpture.

Antennae slender and long, reaching almost posterior fifth of pronotum when reclined. Antennomere 1 twice longer than antennomere 11, antennomere 2 slightly shorter than antennomeres 2-3 combined.

Pronotum longer than wide (ratio 25: 23), distinctly narrowed anteriorly, anterior angles indistinct, bearing several bristles, posterior angles markedly rounded. Each dorsal row with 6 approximately equidistand 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 lacks microsculpture.

Scutellum very finely and sparsely punctate, diameter of punctures smaller than eyefacets, separated larger than 1 puncture diameter in transverse direction. Surface with microsculpture consisting of transverse waves.

Elytra slightly longer than wide (ratio 25: 23), parallel-sided, very coarsely and densely punctate, diameter of punctures twice larger than eye-facets, separated smaller than 1 puncture diameter, slightly contiguous here and there. Surface lacks microsculpture; setation greyish.

Legs. Metatibia longer than metatarsus (ratio 18: 17), metatarsomere 1 slightly shorter than metatarsomere 5, as long as metatarsomeres 2-3 combined.

Abdomen wide, gradually narrowed posteriorly beginning with visible tergite III, punctation at base of all tergites very fine and sparse, 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. quadriceps it differs from similar G. ingratus by the paler antennomeres 1-3, narrowed head, shorter eyes and by the different shape of the aedeags.

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