Fly Seeks ID, #2 - Odontoloxozus longicornis
Saguaro National Park near Tucson, Arizona, USA
March 7, 2004
This fly was on a fallen Saguaro cactus in Saguaro National Park. My Field Guide to Insects (Borror and White) suggests this is a Neriidae, or cactus fly, and says there are only two species in the U.S. I wish they said what the two species were and how to tell them apart. Can anyone help?