Aphrastus submarginatus (Champion 1911)

Moderately elongate, somewhat flattened above, narrow, piceous or ferruginous; variegated above with a dense clothing of cinereous and brown scales, the latter usually condensed into a median vitta on the prothorax and small indeterminate confluent spots on the elytra, the markings sometimes almost obsolete, the scales on the under surface cinereous or whitish; the surface also set with minute scattered 2 QQ 2decumbent setæ. Head and rostrum finely canaliculate, the rostrum broad, transverse, the scrobes short and converging posteriorly; antennæ stout, barely reaching the base of the prothorax, the scape not extending beyond the eyes, joint 2 of the funiculus shorter than 1, the club rather small; eyes comparatively small, depressed. Prothorax about as long as broad, obliquely narrowed anteriorly, subtruncate at the base, obsoletely canaliculate, sloping and somewhat hollowed towards the sides (appearing fairly margined posteriorly), finely punctate. Scutellum transverse. Elytra subparallel in their basal half in ♂, gradually widened to the middle in ♀, subtruncate at the base, the humeri rather prominent; finely punctate-striate, the interstices feebly convex. Legs moderately stout.
 
Length 4 4/5—6¾, breadth 1 2/3—2 2/5 millim. (♂ ♀.)

Hab.MEXICO, Presidio and Milpas in Durango (Forrer), Lerdo (Fenyes, ex coll. Bovie), La Noria in Sinaloa (Höge), Matamoros Izucar and Tehuantepec (U. S. Nat. Mus.).

Numerous examples, varying in size and in the extent of the brown markings on the upper surface, these being almost obsolete in some specimens. The somewhat explanate sides of the prothorax, the subtruncate base of the elytra, and the smaller eyes separate A. submarginatus from A. angularis. The falciform deciduous portion of the mandible is acute at the tip.