Hoplitoxenina

Hlaváč, Peter & Nakládal, Oto, 2016, The Pselaphinae (Coleoptera: Staphylinidae) of Madagascar. IV. Contribution to the knowledge of subtribes Hoplitoxenina and Dimerometopina with description of a new species of Hadrophorus Fairmaire, 1898, Zootaxa 4105 (3), pp. 274-284 : 276

Key to Hoplitoxenina and Dimerometopina

1. Humeri simple, lacking tooth, head strongly divided into two parts connected by narrow bridge, antennae 5-segmented, pronotum with antebasal fovea, lacking pronotal median sulcus (Dimerometopina)............... Dimerometopus Célis, 1970

- Humeri with strong, projecting tooth, head compact, antennae 3-segmented, pronotum with or without antebasal fovea but with well-defined pronotal median sulcus (Hoplitoxenina).................................................... 2

2. Base of elytra with 3 basal foveae or 3 depressions in place of foveae, posterior angles of elytra obliquely cut-off, elytral trichomes thin and long, seta-like, trichomes on paratergites large, dense.................. Hadrophorus Fairmaire, 1898

- Base of elytra smooth, lacking foveae or depressions, posterior angles of elytra sharp or obtuse, trichomes on elytra and paratergites short, triangular or absent..................................................................... 3

3. Pronotum hemispherical, sides rounded......................................... Burgeonilla Reichensperger, 1930

- Pronotum subrectangular, sides straight, anterior angles projecting.............................................. 4

4. Trichomes on elytra and paratergites IV present, basal depression on composite tergite entire along its whole width....................................................................................... Hoplitoxenus Jeannel, 1960

- Trichomes on elytra and parategites IV absent, replaced by few setae, basal depression on composite tergite narrow, about 1/3 of its width...................................................................... Monodiger Paulian, 1949