I 5 4 NORTH AMERICAN DIPTERA. 



third and fourth veins not furcate; anal angle rounded; 

 basal cell short. 



But three or four species of this singular family are 

 known, and of them even, as far as I am aware, the larval 

 habits are yet unknown. The known American species 

 belong to one genus, Orphnephila Haliday; a second 

 genus has been proposed by Mik. The small fly is found 

 on the banks of streams. 



