120 The Rocky Mountain Locust. 



got, (Fig. 21, c) of the same general form of the common 

 meat maggots or "gentles," but measuring, when full grown 

 and extended, not quite one-fourth of an inch in length. 

 The head, with some of the anterior joints of the body, 

 tapers and is retractile, and the jaws consist of two small 

 hooks joined to a V-shaped, black, horny piece which, as 

 it is retracted or extended, plays beneath the transparent 

 skin. The hind or tail end is squarely docked off, and 

 contains two small yellowish-brown, eye-like spots, which 

 are the principal spiracles or breathing pores. 



These small maggots are found in the locust egg-pods, 

 either singly or in varying numbers, there sometimes being 

 a dozen packed together in the same pod. They exhaust 

 the juices of the eggs, and leave nothing but the dry and 

 discolored shells ; and where they are not numerous 

 enough to destroy all the eggs in the pod, their work, in 

 breaking open a few, often causes all the others to rot. 



When fed to repletion, this maggot contracts to a little 

 cylindrical, yellowish -brown pupa, (Fig. 21 b), about half 

 the length of the outstretched and full-grown larva, and 

 rounded at both ends. From this pupa, in the course of a 

 week in warm weather, and longer as the weather is colder, 

 there issues a small, grayish, two-winged fly (Fig. 21 a), 

 about one-fourth of an inch long, the wings expanding 

 about one-half of an inch, and in general appearance re- 

 sembling a diminutive house-fly, except that the body is 

 more slender and more tapering behind, and the wings 

 relatively more ample. More carefully examined, the body 

 is seen to be of an ash-gray color, tinged with rust-yellow, 

 and beset with stiff, bristle-like hairs, those on the thorax 

 stoutest, and those on the abdomen smaller but more uni- 

 formly distributed. The wings are faintly smoky and 

 iridescent. There are three dusky longitudinal stripes on 

 the thorax, most distinct anteriorly, and another along the 



