The Shoofly, Dance Fly, One More Thing

Assuming these are the same species, then, one is probably male and one is probably female. That's what I figure. But which is dang which? Well, I need to find out how to sex these particular flies. Matter of fact, keeping these flies as pets, I need to dern sure know what sex they are.

Later. OK. I have figured these fuckers out. The one on the right is the female. That makes the one on the left the, uh, boy. Turns out ncsu.edu has come to the rescue of the ignorant. The fact is, these dance flies may be genus Rhamphomyia. Still not even close to a species call. But hey, this is the Republic of Tejas.