Cremastocheilus retractus

One of about forty-five species of myrmecophilous Cremastocheilus. The host ant is Formica.

Distribution
Colorado, Kansas, Texas

Habitat
Common host is Formica.

Nomenclature
Texas; Mr. Belfrage. One specimen. The mentum is deeply and broadly incised behind. This species is allied to Cremastocheilus canaliculatus, but the prothorax is more convex, the foveae adjacent to the front angles do not extned to the apical margin and the hind angles are much retracted, so that the base is fully one-fourth narrower than the middle of the prothorax, as in Cremastocheilus variolosus, to which it in other respects has no resemblance. (LeConte, 1874)

Description
Brownish-black, not shining; prothorax wider than long, coarsely punctured, narrowed in front, broadly rounded on the sides, foveate inside of the front angles, foveae not extending to the apical margin, hind angles suddenly and strongly retracted, acute, surrounded by a deep groove; elytra flattened, with the usual sculpture of large shallow punctures, not closely placed. Length .44 inch; 11 mm.(LeConte, 1874).