34 spp. in 11 genera in our area(1)
, ~350 spp. in 38 genera total(2)
Small, shining blackish flies, sometimes with a reddish tinge; spherical head; abdomen narrowed at the base. Many species have a dark spot along the costal margin of the wing near the tip.
Larvae live in excrement and various types of decaying matter. Adults found near material that the larvae feed on.(3)(4)