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Promachus rufipes
Thanks for the help IDing it!
I'd never heard of Robberflys or Cannibalflys before now!
These flies have even been reported to attack hummingbirds!
http://www.hiltonpond.org/ThisWeek070901...
Spectacular spotting, batex! Gilma is right, this is an absolutely gorgeous robberfly. This is from the genus Promachus which consists of very large robberflies known as giant robberflies or cannibalflies.