Key to the Families of Diptera Associated with Cow Dung

Couplet 25

Either:	Or:
25a.   Posterior thoracic spiracle with one or more distinct bristles on posteroventral margin	25a'.   Posterior thoracic spiracle without distinct bristles or outstanding hairs
25b.   Slender usually black to purple coloured flies, often bearing dark spot on wing tip	25b'.   Stouter yellow, brown, or grey coloured flies
Sepsidae	Go to 26

First published on the Internet in 2000 by J.M. Cumming
Last updated 18 May 2006 by J.M. Cumming and G.D. Murray