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Photo#223942
Giant Robber Fly - Promachus nigrialbus

Giant Robber Fly - Promachus nigrialbus
West of Benson, bordering Cochise County, Arizona, USA
September 1, 2008
I believe I have matched this one to an image and description in the "National Audubon Society Field Guide to the Southwestern States."
They call it a Giant Robber Fly. I spotted this one at around 3:00 pm on an Agave plant in my front yard, 4,600 elevation in a rural desert area.

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Giant Robber Fly - Promachus nigrialbus Giant Robber Fly - Promachus nigrialbus