JAN 1 1 1920 



BULLETW"^ 



OF THE 



BROOKLYN ENTOMOLOGICAL SOCIETY 



Vol. XV December, 1920 No. 5 



A SYNOPSIS OF THE NORTH AMERICAN SPECIES OF THE 



GENUS PEGOMYIA ROBINEAU-DESVOIDY (DIPTERA, 



ANTHOMYIID^). 



By J. R. Malloch, Urbana, Ills. 



The species included in the key all conform to my recent diag- 

 nosis of this genus. All have but two posterodorsal bristles on 

 the hind tibia except friseta and bicolor which have frequently 

 three, and the most of the species have also only two anterodorsal 

 hind tibial bristles. In the great majority of cases the legs are 

 partly or entirely reddish or yellowish, and in many cases the 

 abdomen is also partly pale. No species known to me has a blunr 

 bristle at apex of fore tibia on the posterior side, and no species 

 has the hind tibia in male with short erect hairs on ventral 

 surfaces. 



Key to Species 



Males 



1. All femora entirely pale or only the fore pair partly 



inf uscated 2 



— All femora partly or entirely inf uscated 28 



2. Prealar bristle less than half as long as the one behind 



it 3 



— Prealar bristle over half as long as the one behind it. . 20 



3. Length of third antennal segment greatly exceeding 



height of cheek; distance between vibrissae twice or 

 more than twice as great as distance from either to 

 nearest point of eye-margin ; abdomen depressed ; all 

 femora pale ; lower calyptra usually distinctly pro- 

 truded 4 



121 



