THE MYCETOPHILIDA, 
II. Abdomen with six segments. 
a. Hind vein forked. 
6, Fork short. 
bb. Fork long. 
aa. Hind vein not forked. 
4. Middle discoidal forked. 
66. Middle discoidal not forked. 
B. Three ocelli: one on the inner border of 
each eye ; third in the middle of the 
fore front. 
a. Costal vein extending much beyond 
the tip of the cubital vein. 
Two ocelli: one on the inner border of 
each eye. The third either in a pit 
and scarcely noticeable or absent. 
a. Base of fourth hind areolet nearly in a 
transverse line with that of the second 
hind areolet. 
6. Base of fourth hind areolet much more 
distant from base of wing than is the 
base of second hind areolet. 
Base of fourth hind areolet much 
nearer to the base of wing than is 
the base of the second hind areolet. 
6. Petiole of second hind areolet long. 
66. Petiole of second hind areolet short. 
aaa. No fourth hind areolet. 
é. Fore cubital areolet moderately broad. 
6b. Fore cubital areolet very narrow. 
¢. Hind vein not forked. 
a. Base of fourth hind areolet in a trans. 
| verse line with that of the second. 
, aa. Base of fourth hind areolet more dis- 
tant from base of wing than is base 
of the second hind areolet. 
6. Costal extending a little beyond the 
cubital. 
c. Costal not extending beyond tip of 
cubital. 
a. Base of fourth hind areolet a little 
nearer base of wing than is the base 
of second hind areolet. 
> 
= 
Celosia. 
Leta. 
Acnemia. 
Asana. 
Mycetophila. 
Dynatosoma. 
Cordyla. 
Exechia. 
Mycothera. 
Zygomyia. 
Sceptonia. 
Deocesia. 
Anatella. 
Phronta. 
103, 
