Trinodia

Species of this subgenus of Cremastocheilus are most often found in the nests of Myrmecocystus.

Identification
Key to Trinodia species

This subgenus consists of twelve species; Cremastocheilus planipes, Cremastocheilus mentalis, Cremastocheilus saucius, Cremastocheilus quadricollis, Cremastocheilus setosifrons, Cremastocheilus hirsutus, Cremastocheilus excavatus, Cremastocheilus constricticollis, Cremastocheilus opaculus, Cremastocheilus spinifer, Cremastocheilus lengi and Cremastocheilus stathamae. Posterior angles of pronotum with inner margin raised and extending forward onto disc, dividing pronotal disc longitudinally into three unequal thirds; clypeus with a median carina, anterior angles with a deep incisure, forming in front an auriculate lobe. These areas contain exocrine glands which probably mediate interactions with ants.

Distribution
From Mexico City north to Wyoming, and southern California east to Texas. Includes Arizona, New Mexico, Colorado, Kansas and Nebraska.

Habitat
Desert, arid areas.