Natural Enemies. 



123 



The Common Flesh Fly (Sarcophaga carnaria, L.) — 

 The red-tailed variety (sarracenice) of this ubiquitous 

 insect, described and figured further on, as preying on the 

 locust, also attacks its eggs. It is a larger maggot than 

 the preceding, and contracts to a darker pupa which is 

 not similarly rounded at each end, but has the hind end 

 truncate, and the front end tapering. It sucks the eggs, 

 as does the Anthomyia larva, but the parent fly is probably 

 attracted principally to those which are addled or injured, 

 as the pods in which I have found it have very generally 

 I>een in a fluid state of decay. From three quarts of eggs 

 I have obtained twenty -.six of these flies. 



Undetermined Species. — Next to the Anthomyia Egg- 

 parasite in importance is a much larger, more sluggish, 



undetekmikedEgg-paeasiteofr. m. 11 is a smooth grub, with 



tened head, with the joints near the head swollen, and the 

 hind end tapering, and with deep, translucent sutures 

 beneath the joints, which sutures show certain vinous 

 marks and mottlings, especially along the middle of the 

 back. It exhausts the eggs, and leaves nothing but the 

 shrunken and discolored shells. It has not yet been reared 

 to the perfect state, but from the structure of its mouth 

 it is evidently Hymenopterous, and will produce, without 

 much doubt, some Ichneumon-fly. It has been found in 



[ Fig. 22.] 



yellowish grub (Fig. 22), 

 measuring about half an 

 inch when extended, 

 which is found within or 

 beneath the locust eggs, 

 lying in a curved position, 

 the body being bent so 

 that the head and tail 

 nearly touch each other. 



Locust. 



a very small, brown, flat- 



