Gabrius, STEPHENS, 1829

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 : 1392-1393

Key to the species of the genus Gabrius from Madagascar

1 Larger species, body length 6.7-7.2 mm .............................................................................2

- Smaller species, body length 4.0- 5.6 mm ............................................................................3

2 Whole antennae black, pronotum parallel-sided, eyes about one third shorter than temples (ratio 8: 11.5) .................................................................. G. ingratus FAUVEL 1905

- Antennomeres 1-3 yellow-brown, pronotum narrowed anteriorly, eyes shorter than temples about one a half (ratio 6: 12)...................................... G. quadriceps JARRIGE 1978

3 Pronotum narrowed anteriorly............................................................................................4

- Pronotum parallel-sided......................................................................................................5

4 Punctation of elytra denser, separated by one puncture diameter, legs yellow-brown, tibiae slightly darker................................................................................ G. ardeola nov.sp.

- Punctation of elytra sparser, separated by two puncture diameters, legs brown-yellow, tarsi paler distally ............................................................................. G. lemur JARRIGE 1978

5 Head parallel-sided..............................................................................................................6

- Head narrowed posteriorly, trapezoidal..............................................................................7

6 Antennae shorter, reaching midlength of pronotum when reclined, head slightly shorter than long (ratio 15: 16), eyes less than twice shorter than temples (ratio 5: 9)........ ....................................................................................................... G. cyanolanus nov. sp.

- Antennae longer, reaching posterior fifth of pronotum when reclined, head wider than long (ratio 16: 14), eyes more than twice shorter than temples (ratio 5: 12) ......................... ............................................................................................. G. tsaratananus JARRIGE 1970

7 Each dorsal row with 5 punctures, antennae long, reaching posterior sixth of pronotum when reclined ....................................................................... G. phelsuma HROMÁDKA 2007

- Each dorsal row with 6 punctures.......................................................................................8

8 Whole body brown-red, antennomeres 1-2 yellow-brown, remaining antennomeres dark-brown .......................................................................... G. fimbriolatus ERICHSON 1840

- Whole body black...............................................................................................................9

9 Head wider than long (ratio 20: 17), eyes slightly shorter than temples (ratio 6: 8) ............. ............................................................................................................ G. taphozous nov.sp.

- Head as long as wide, eyes more than twice shorter than temples (ratio 5: 12) .................... .................................................................................................. G. delamarei JARRIGE 1970