Neivamyrmex californicus - Army Ants
Army ants on the march. This species, Neivamyrmex californicus, is endemic to California and Baja California. Neivamyrmex are the most diverse and widely-distributed of the new world army ants, and are the only army ants found in the temperate regions of North America. Although these ants are not uncommon, they are not often encountered because of their partly subterranean habits. Most Neivamyrmex are specialized predators of other ant species.

Photograph: Photographer and entomologist Alex Wild at the University of Arizona. ?? Alex Wild www.myrmecos.net