Diptera Associated with Livestock Dung Key to the Families of Diptera Associated with Cow Dung* by Jeffrey M. Cumming Invertebrate Biodiversity Agriculture and Agri-Food Canada 960 Carling Avenue Ottawa, Ontario, Canada K1A 0C6

Couplet 1

Either:	Or:
1a.   Antennal flagellum with four or more freely articulated flagellomeres, without apical stylus or arista	1a'.   Antennal flagellum consolidated into apparent single segment, typically bearing apical stylus or arista
1b.    Palpus usually with three to five segments	1b'.    Palpus with two or less segments
(NEMATOCERA) Go to 2	(BRACHYCERA) Go to 11

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