1. C. acutus.- Cinereous; clypeus profoundly emarginate; a blackish band behind the middle of the elytra. Inhabits Missouri. Body brownish-cinereous, punctured, covered with minute imbricate scales: head profoundly and acutely emarginate at tip, a longitudinal, impressed line: eyes black: antennae, club blackish; elytra with punctured series somewhat in pairs; interstitial lines convex, alternate ones rather more elevated ; a black-brown band rather behind the middle, abbreviated each side ; tip a little prominent, acute : thighs mutic ; a black, longitudinal, impressed line beneath the head. Length three-tenths of an inch. The dusky band of the elytra has a jagged anterior and posterior outline. [This is the type of Brachystylus.-Lec.]