1	Tarsomeres of all legs glabrous dorsally. Elytra with parascutellar striae well-engraved (long in Orthomus, Abacillodes, Parorthomus gen. n., short in Abacillius)	2
–	Tarsomeres of all legs pubescent dorsally. Elytra with parascutellar striae vestigial or lacking	6
2	Elytra with discal setiferous punctures in interval 3 / stria 3. Mentum tooth bifid	3
–	Elytra without discal setiferous punctures. Mentum tooth hardly excavate (Abacillodes aculeatus) or round (Abacillius basilewskyi) at tip	Abacillius Straneo, 1949
3	Elytra with two setiferous punctures in interval 3 / stria 3, with last puncture in medial third of elytron	4
–	Elytra with three to four setiferous punctures in interval 3 / stria 3, with last puncture in posterior third of elytron	Parorthomus gen. n.
4	Pronotum subquadrate (sides straight or slightly narrowed towards hind angles), with anterior angles slightly to moderately prominent forward. Abdominal sternites V-VII with transverse sulci complete and well-impressed	5
–	Pronotum subtrapezoid (sides broadened towards hind angles), with fore angles fairly prominent forward. Abdominal sternites V-VII with transverse sulci distinct only laterally (Nesorthomus annae Donabauer, 2008, Nesorthomus bedelianus Lutshnik, 1915 and Nesorthomus dilaticollis Wollaston, 1854) or lacking (remaining species)	Nesorthomus Bedel, 1899
5	Species with intercoxal process of prothorax bordered and distribution in the Mediterranean biogeographical region	Orthomus Chaudoir, 1838
–	Species with intercoxal process of prothorax slightly bordered (Abacillodes jocquei) or unbordered (Abacillodes malawianus) and distribution in the Afrotropical biogeographic region (Malawi)	Abacillodes Straneo, 1988
6	Smaller species (less than 6 mm), with continental distribution in northwest Africa	Trichopedius Bedel, 1899
–	Larger species (more than 6 mm), with insular distribution in the Macaronesian biogeographical region	7
7	Head with distinct eyes and paraorbital sulci not extended behind posterior margin of eye. Elytra truncate apically	Eutrichopus Tschitschérine, 1897
–	Head with very small or no eyes and paraorbital sulci grooved, extended behind posterior margin of eye toward neck. Elytra rounded apically	8
8	Sides of pronotum straight towards hind angles. Elytra not narrowed basally	Gietopus Machado, 1992
–	Sides of pronotum distinctly concave towards hind angles. Elytra narrowed basally	Wolltinerfia Machado, 1985