Grasshoppers 



While the Rocky Mountain locust has almost ceased to be a pest, 

 there are several other species of grasshoppers which frequently occur in 

 great numbers and do much damage to crops within restricted areas. 

 Three of these species — the two-lined hopper, the differential hopper and 

 the red-legged locust — are worthy of special mention. 



(a) TWO-LINED HOPPER 



(Figs. 9, 10 and 11, Plate IV, Page 17) 



The two-lined hopper, together with the two following species, often 

 occurs in large numbers in the Great Plains area. 



It is easily distinguished from our other injurious species by the two 

 light lines beginning at the eyes and extending along the back and meet- 

 ing at the tip of the wings. 



The females, one of which is shown, natural size, in Figure 10, Plate 

 IV, Page 17, are larger than the males. The color of both sexes is yellow- 

 ish or tan color, with darker, almost black markings. Some of the males 

 are much darker than the females, there being very little yellow visible 

 on these dark individuals. However, the light lines mentioned above 

 are always clearly discernible. 



(b) DIFFERENTIAL HOPPER 



(Figs. 12 and 13, Plate IV, Page 17) 



Many times the differential hopper outnumbers the preceding one. 

 Since the passing of the Rocky Mountain locust it has been one of the 

 principal injurious forms in the Great Plains area. 



This hopper occurs in two colors, with many intermediate shades. 

 Figure 12, Plate IV, Page 17 represents a male of the light or yellow 

 phase, while Figure 13, Plate IV represents the opposite color extreme. 



In size this hopper resembles its near relative, the two-lined hopper. 

 However, in all its color variations, it can be distinguished from the two- 

 lined hopper by the lack of the two pale lines on the back. 



(c) RED-LEGGED LOCUST 



(Figs. 14 and 15, Plate IV, Page 17) 



The red-legged locust may be taken as representative of a group of 

 small or medium sized species which have in the past been responsible 

 for widespread damage to crops. 



In general appearance and size the red-legged locust resembles the 

 Rocky Mountain locust already referred to, the lesser migratory locust, 

 and the California devastating locust. 



It is very difficult to give a popular description of this grasshopper 

 that will make it possible for one not trained in entomology to distinguish 

 it from the other three species mentioned in the preceding paragraph. 



Figure 14, Plate IV, Page 17 represents an average male, natural 

 size. The females are somewhat larger. The color of this hopper is 

 variable, being brownish, shaded with almost black in the darker indi- 

 viduals. In the light individuals, the lighter portions are yellowish 

 brown. 



The slender part of the hind legs is usually reddish, although in some 

 specimens it is yellowish or even pale green. 



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