INSECTS AFFECTING GRAINS, GRASSES, ETC. 101 



The Differential Locust. Throughout the Mississippi Valley 

 from Illinois southward, the Differential Locust is one of the most 



FIG. 79. The differential locust (Melanoplus differentials Thos.). 



Riley.) 



(After 



common and destructive grasshoppers, and is an excellent example 

 of several of our more abundant and injurious species which have 

 very similar habits. 



FIG. 80. The southern lubber grasshopper (Dictyophorus reticulatus) : nymph 



";ht~ 



and adult, slightly enh 



The little grasshoppers hatch about the middle of May, 

 from eggs which were laid in the fall, though we have observed 



them in March in Central Texas, and 

 are of a dusky brown color, marked 

 with yellow. The head and legs are 

 the most prominent feature of the 

 young nymphs. During their sub- 

 sequent growth they molt five times 



FIG. 81. Egg-mass of the 

 differential locust enlarged, 



at intervals of ten days to two weeks, the relative size and ap- 

 pearance of the different stages being shown in Fig. 82. 



