Ant-like Flower Beetle
Anthicus ?
Photographed on flowers of Holly-leaf Buckthorn (Rhamnus crocea). Near Seven Springs, Maricopa Co., Arizona, USA. 10 May 2014.
Anthicidae -- Ant-like Flower Beetle Family
Minute beetles (the one shown here is about 3mm long) most frequently observed on flowers where because of the constrictions between segments they resemble ants. The larval stage might live in the leaf litter or within nests of bees scavanging on pollen, etc.