'J' lie Robber Flies. 



417 



much resembles that of the genus Promachus, though the 

 form of these insects is very different. . 



In Mallopliora and Promaclius the venation is as repre- 

 sented in Fig. 202, where, as will be seen, the second vein 

 (Fig. 202, 3) forks, while in the genus Asilus (Fig. 196) 



Fig. 202. 



the third vein is forked, though in all three genera the 

 third joint of the antennae (Fig.- 200) ends in a prolonged 

 bristle. 



One of the most common of these pests, which I am 

 informed by Dr. Hagen is Mallaphora orcina, Weid., is 



Fig. 



203. 



one inch long, and expands one and three-fourths inches 

 (Fig. 203). The head (Fig. 200) is broad, the eyes black 

 and prominent, the antennae three-jointed, the last joint 

 terminating in a bristle, while the beak is very large, 

 strong, and, like the eyes and antennae, coal black. This 



