DIPTERA OF MINNESOTA. 



137 



The genus Cntebra contains a number of bot flies, some of them 

 common in Minnesota, of special interest, although not of decidedly 

 economic importance. These are the flies whose larvae we find on 

 rabbits, generally on the neck, and frequently on gophers and squirrels. 

 Unidentified bots, possibly belonging to this genus, have been taken 

 from beneath the jaws of kittens. C. cuniciili is a common bot found 



Fig. 129. Larvae of Emasculating Bot-fly in Striped Gopher, natural size. Lugger. 



Oi\\ the rabbit, and C. fontinella, Clark, has been taken from the rabbit 

 in New Mexico. Squirrels are sometimes found emasculated, which 

 is undoubtedly the work of the emasculating bot fly, which may be 

 the species shown in our illustration, and not the work of other squir- 

 rels, as was at one time generally supposed. Fig. 129 shows a portion 

 of a striped gopher with larvae of the emasculating bot fly in the scrotal 

 region. There is much to be learned regarding the species of this 

 genus in Minnesota, but such knowledge is not of special value to the 

 farmer. We have here, to our certain knowledge, two or three species, 

 C. haccata, C. horriphilum, and probably others. These are large flies, 

 as shown by the hair lines on the side of the figures. They are more 

 or less hairy, with large eyes. One species has red eyes, and is marked 

 with yellow, white and black. Another has dense, brownish fur on the 

 thorax, and another is entirely black. 



