This should be the correct identification. Tabanus laticornis is recorded from Arizona like this one, and Tabanus nigrovitattus is only found in salt marsh areas of the east coast. Plus it was identified for me by a dipterist specializing in Tabanids here.
http://bugguide.net/node/view/197264
Guest
15-Nov-2009 03:27
Hey I was looking through your fly fotos, and you have some beautiful ones here, but isn't this one nigrovitattus?