Large and exotic, this fly is actually harmless to humans with neither a bite nor a sting. The female lays its eggs in carpenter bee nests, where the fly larvae seek out and devour carpenter bee larvae before they can mature and escape.
An interesting fly in both appearance and behavior. Something like the “Brown Cowbird” of insects, it will lay its eggs in the nest of wasps. The unsuspecting wasp stocks the nest with provisions for its own larva, but this fly’s larva gets fed instead.