THE SOUTHWESTERN United States, with its hot, dry desert and semi-desert habitats, is one of the most species-rich areas in the world for Robber Flies, as well as related Families Apioceridae and Mydidae. Here is the first and only illustrated guide dedicated to the identification of these amazing creatures. This book features 207 different Southwestern species, detailed in forty-four color plates. With more than 50 photographs and newly published information, this work is indispensable for the study of these popular families of Diptera.