Brachysomus, Schoenherr, 1823:, 1124

Yunakov, Nikolai, 2022, A review of the genus Brachysomus Schoenherr (Coleoptera: Curculionidae: Entiminae), Zootaxa 5193 (1), pp. 1-165 : 17

Brachysomus s. str.: B. hirtus group

1. Setae on elytra strongly erect and long (as long as interstrial width). Epifrons with deep median longitudinal sulcus, separated from vertex by distinct transverse depression. Aedeagus attenuate, with apex rounded ( Fig. 196A), obtuse, or acuminate ( Fig. 195A). Body length 1.75–2.60 mm....................................................................... 2

- Setae on elytra suberect and short (as half interstrial width). Epifrons with shallow median longitudinal sulcus, separated from vertex by slight transverse depression. Aedeagus evenly acute ( Fig. 198A). Body length 1.50–2.37 mm... B. subtilis Yunakov

2. Eyes weakly convex. Rostrum subconical ( Fig. 196C). Body fully covered with wide scales ( Fig. 196G). Apex of median lobe rounded ( Fig. 196A)..................................................................... B. dubius Yunakov

- Eyes hemispherical. Rostrum parallel-sided, if noticeably narrowing from base to middle part, then eyes always very strongly convex. Scales narrowly oval and bifurcate ( Fig. 194J). Apex of median lobe obtuse or nipple-shaped.................. 3

3. Tibiae in male strongly mucronate ( Fig. 197H). Rostrum in female narrowing towards distal end of basal half ( Fig. 197E). Aedeagus attenuate, its apex truncate ( Fig. 197A). Collum of spermatheca strongly curved ( Fig. 197C)................................................................................................... B. mucronatus Yunakov

- Tibiae in male moderately mucronate ( Fig. 194H, 196F). Rostrum parallel sided in both sexes. Aedeagus strongly narrowing apically, its apex simple or nipple-shaped. Collum of spermatheca not strongly curved............................... 4

4. Body sparsely scaled. Male 5th ventrite distinctly flattened in apical third. Eyes weakly convex ( Fig. 194E). Aedeagus weakly sclerotized, evenly narrowing apically, obtuse, as long as 1/3 of body length ( Fig. 194A). Spermatheca ( Fig. 194C)............................................................................................ B. hirtus (Boheman)

- Body densely scaled. Male 5th ventrite convex at apical third. Eyes strongly convex ( Fig. 195D).Aedeagus strongly sclerotized, sharply narrowing apically, attenuate, apex nipple-shaped, as long as 1/2 of body length. Spermatheca ( Fig. 195C)............................................................................................. B. fasciatus Stierlin