Cephalomyrmex

There is a single species from the Florissant shale (Oligocene) from Colorado, USA.

Identification
Female. - Robust; head exceedingly large, rounded; thorax short; gaster very small; antennae abbreviated, the funiculus apparently with only five or six segments; petiole pedunculate, postpetiole short but broad. (Venation unknown).

Castes
Queen.

Additional References

 * Carpenter, F. M. 1930. The fossil ants of North America. Bull. Mus. Comp. Zool. 70: 1-66