SCENOPINID.E. 209 



teen segments, due to each of the abdominal segments 

 except the last being partially divided by a strong con- 

 striction. The larvae have been found in decaying fungi 

 and wood and under carpets or in furniture, and are sup- 

 posed to be carnivorous. The flies are not very active 

 in their habits, and because of the frequency with which 

 some are observed on window-panes are usually called 

 window-flies. 



TABLE OF GENERA. 



1. First posterior cell open (1,2) Scenopinus. 



First posterior cell closed before the margin of the wing. . 2 



2. Body short, clothed with scales (3, 4). . . Metatrichia. 

 Body elongate, without scales (5). . . . Pseudatrichia. 



