104 AN ACCOUNT OF BRITISH FLIES. 
6. Petiole of second hind areolet very 
short. 
6b. Petiole of second hind areolet long. 
aa. Base of fourth hind areolet much 
nearer to base of wing than is the 
base of second hind areolet. 
6. Costal ends a little before tip of wing. 
Sub-family Sciophiline. 
A. Costal vein extending to tip of wing. 
B. Costal not extending to tip of wing, 
a. Base of fourth hind areolet much 
nearer base of wing than is base of 
second hind areolet. 
6. Base of fourth hind areolet a little 
nearer to base of wing than is base 
of second hind areolet. 
a. Second hind areolet with very long 
petiole. 
aa. Second hind areolet with moderately 
long petiole. 
c. Base of fourth hind areolet in a 
transverse line with the base of the 
second, or very near the base of the 
wing. 
ad. Base of the fourth hind areolet much 
more distant from the base of the 
wing than is the base of the second 
hind areolet. 
Sub-family Ceratopline. 
A. Mouth elongated, like a beak. 
B. Mouth not elongated like a beak. 
a. Antenne dilated; palpi not bent to- 
gether. 
6. Antennz not dilated ; palpi bent to- 
gether. 
Sub-family AZycetobine. 
A. Brachial vein and cubital forming a sessile 
fork. 
Rymosia, 
Allodia. 
Brachycampta. 
Sciophila. 
Empheria. 
Polylipta. . 
Empalia. 
Tetragoneura. 
Lastosoma. 
Asindulum. 
Ceratoplatus. 
Platyura. 
Mycetobia. 
