490 



THH bbb-kbbper's guidb ; 



destroying habits, a species of Erax (Fig. 270). In form it 

 resembles the one referred to above. The wing (Fig. 269), as 

 will be seen, is quite different in its venation. I received this 



Fig. 270. 



Fig. 271. 



Bobber-Fly and Wing. — Original. 



species from L,ouisiana. Fig. 272 shows the antenna; magni- 

 fied. The Nebraska bee-killer, Promachus bastardi, is the 



Fig. 272. 



Fig. 273. 



Head and Tarsus of Robber-Fly. — Original. 



same in general appearance as the above. The second vein of 

 the primary wing, not the third, asiu the case of Asilus, forks. 

 In Erax, as seen in Fig. 271, this branch is disconnected. 



