I04 



AN ACCOUNT OF BRITISH FLIES. 



b. Petiole of second hind areolet very 

 short. 



M. 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. 



b. Costal ends a little before tip of wing. 



Rymosia. 



Allodia. 



Byachycaiiipta. 



Sub-family Sciophilince. 



A. Costal vein extending to tip of wing. Sciophila. 



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. EmpJieria. 



b. 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. Polylipta. 



aa. Second hind areolet with moderately 



long petiole. Empalia. 



c. Base of fourth hind areolet in a 



transverse line with the base of the 

 second, or very near the base of the 

 wing. Tetragoneiira. 



d. Base of the fourth hind areolet much 



more distant from the base of the 

 wing than is the base of the second 

 hind areolet. Lasiosoina. 



Sub-family Ceratoplince. 



A. Mouth elongated, like a beak. Asindulnin. 



B. Mouth not elongated like a beak. 



a. Antennae dilated ; palpi not bent to- 



gether. Ceratoplatus. 



b. Antennae not dilated ; palpi bent to- 



gether. Platytira. 



Sub-family Mycetobince. 



A. Brachial vein and cubital forming a sessile 



fork. Mycetobia. 



