The Myrmecocystus mendax ant colony is polygynous, with a colony size of 10,000 workers. They have a medium development rate and range in size from 10-12mm for queens and 4-8mm for workers. They are reddish in color with a black back. They feed on food insects, fruits, vegetables. The recommended humidity for their arena is 40-60% and for their nest is 50-70%.