U.S. state species lists

Cole and Wiernasz: population biology of P. occidentalis

"As is evident to anyone who explores the Sonoran Zone areas of western United States, Pogonomyrex occidentalis is an exceedingly abundant and conspicious ant. Its habitats have been well known for many years, beginning with the celebrated investigations of the Rev. H. C. McCook, and probably no more characteristic ant (or even insect) can be found in the western plains. Its conical nests are as diagnostic of the praries as the prairie-dog burrows and as the bison."

......Gregg, The ants of Colorado

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P. occidentalis worker

a nest mound

mating time in the desert

nest mounds