A Pogonomyrmex rugosus worker shows off her psammophore, the basket of long hairs on the underside of her head used for carrying sand grains. This structure enticed Austrian taxonomist Gustav Mayr to name this genus Pogonomyrmex, or "bearded ant". Tucson, Arizona, USA

A busy nest of Pogonomyrmex rugosus harvester ants in urban Tucson. Tucson, Arizona, USA