Cremastocheilus lengi

One of about thirty-five species of myrmecophilous Cremastocheilus. The host ant is Pheidole desertorum.

Distribution
Arizona (Cochise County, Graham County, Hila County, Pima County, Santa Cruz County)

Habitat
Common host is Pheidole desertorum.

Biology
Cremastocheilus lengi ranges in elevation from 3,750 - 5,500 feet and they have been collected from April to October with a peak of activity in September.

Description
Medium sized ; head, pronotum, elytra and body beneath opaque, black, ciypeus. antennal scape and legs rufous ; tarsi four segmented. Head with vertex rather densely, shallowly punctate, punctures separated by their own widths, front smooth, canthus prominent, with a dense patch of short stout hair on its free end; ciypeus semi-circular, margin widely reflexed and clothed with short stout hair, strongly carinate at middle ; antennae ten segmented, scape large and flat ; mentum evenly, somewhat deeply excavated, reflexed margins even throughout. Pronotum divide longitudinally into three well defined regions, anterior angles auriculate, posterior angles spiniform, widest at apical fourth, sides straight to basal angles, apical angles obtusely rounded, median region on disk irregularly, shallowly, somewhat densely punctate, lateral regions more densely and deeply punuctured, lateral regions slightly more shining than median. Elytra flat, edges sharply reflexed, side margins subparallel, rather abruptly angulate at apices, disk with punctures in the form of elongate scratches which are arranged in more or less definite striae, some of the punctures being longitudinally connected, side margins with sparse, small punctures. Body beneath shining, sparsely clothed with short erect hair, coarse and fine punctures irregularly scattered over entire surface ; legs slender, rufous, tarsi four-segmented, not greatly flattened. Male genitalia the same as in the rest of the species in the genus.