49 



Flesh - flies. 



Ill addition to the Tachina-flies described above, there 

 are other flies which greatly resemble them, that also attack 

 locusts. In writing of these latter flies Professor C. \\ Riley 

 sa^'s: " They greatly resemble the preceding in general ap- 

 pearance, but ma}" be distinguished by the stile of the an- 

 tennae being hair}' instead of smooth. Judging from the ac- 

 counts of correspondents, and the well-known habit of breed- 

 ing in dead and decomposing animal-matter, whicli these flies 



Fíl;-. 14. — Flesli lly or Locusi parasite. 



possess, they are usually attracted to those locusts that are 

 feebleor already dead, and are fond of laying their eggs on speci- 

 mens which have just molted, and are yet pale, soft, and help- 

 less ". Man}' locusts that are suffering from the various fun- 

 gus diseases to which they are subject, also are attacked by 

 these flesh-flies. The CallipJiora iuterrupta mentioned and 

 described by Conil in his treatise on the Argentine locust' is 

 an example of these flesh-flies. 



Predaceous Insects. 



Ground-beetles. — Man}' kinds of these beetles are very 

 active in pursuing and killing the saltonas of both this and 

 other locusts ; and the good they do in this way is very con- 

 siderable. The smaller species of these beetles ( Carabidw and 

 CiciiidelidiC attack the quite young saltonas, while the larger 



