Cremastocheilus retractus incisus

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

Distribution
Colorado (Araphahoe Co., Douglas Co., El Paso Co.), Kansas, Nebraska (Scotts Co.), New Mexico (San Miguel Co.), Wyoming (Laramie Co.); Canada (Alberta, Manitoba).

Habitat
Common host is Formica ciliata from Colorado Springs, El Paso County, 19 July 1903. Found on sand dunes.

Nomenclature
Type Material: Colorado, Araphahoe Co., Denver, no date. Larimer Co., Fort Collins, no date. Kansas.

Description
Legs rufous or rufopiceous, apical parts of head and pronotal angles rufescent; body black, shining; elytra with small narrow punctures; long narrow notch on inside of anterior angles; pygidium surface at apex sparsely punctate; body hairs thick at their bases, becoming sharply pointed apically.