Cremastocheilus retractus incisus

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

Distribution
Colorado, Kansas, Nebraska, New Mexico, Wyoming; Canada (Alberta).

Habitat
Common host is Formica ciliata.

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.