SYSTEMATIC ZOOLOGY, 137 
b. Discoidal forked, or absent. 
Antennal bristle basal  Pipwnculide. 
Antennal bristle apical Lonchopteride. 
4 Empodium membranaceous and linear. 
+ First joint of the antennz very 
short . , . Tachydromide. 
++ First joint of antennze moderate 
Posterior transverse vein oblique to 
posterior border of wing. Hybotidee. 
Posterior transverse vein parallel 
to posterior border of wing . Limprde. 
b. Basal cells short. 
* Discoidal and basal cells united . Dolichopodida. 
** Discoidal and basal cells separate. 
1 Antennz in rounded pits strode. 
2 Antennze not in rounded pits, 
+ First posterior cell closed, or 
nearly closed Muscidee. 
+t First posterior cell widely open. 
Tegulz developed. . Anthomyzide. 
Tegulee rudimentary, or none <Acalyptride. 
