Apterocolus

Elytra ad suturam valde abbreviata, segmentis dorsalibus abdominis quinque visibilibus.

This genus is closely allied to Pterocolus, but has five of the dorsal segments exposed instead of three, the posterior coxæ very widely separated, though the anterior pair are more approximate, and the rostrum furnished with very deep lateral scrobes, which are not visible from the front, as the edge of the rostrum projects over them; similar scrobes exist really in Pterocolus, but owing to the antennæ being inserted nearer to the eyes the scrobes are much less conspicuous than in Apterocolus.