140 Cockroaches, Locusts, Grasshoppers, and Crickets 



miles in area, would be little affected by a bonfire. In Cyprus in 1881, 

 1300 tons of locust-eggs were destroyed; how many eggs go to make a ton 

 one can only faintly conceive of. 



There has been no serious Rocky Mountain locust invasion of the Missis- 

 sippi Valley since 1876, and there will probably never be another. The 

 locust is being both fed and fought in its own breeding range; many are 



FIG. 172. FIG. 175. 



FIG. 172. The emarginate locust, Schistocerca emarginata, male. (After Lugger; nat- 

 ural size.) 



FIG. 173. The pale-green locust, Hesperotettix pratensis, female. (After Lugger; 

 natural size indicated by line.) 



FIG; 174. The short-winged locust, Stenobothrus curtipennis, female. (After Lugger; 

 natural size indicated by line.) 



FIG. 175. The sprinkled locust, Chlcealtis conspersa, male. (After Lugger; natural size 

 indicated by line.) 



killed every year, and for those that are left there is food enough and to spare 

 in the great grain-fields of the northwest plains. 



The genus Melanoplus, to which the Rocky Mountain locust belongs, 

 is the largest of all our Acridiid genera, one hundred and twenty species 

 found in the United States belonging to it. Of these species a very common 

 one all over the country is the red-legged locust, Melanoplus femur-rubrum 

 (Fig. 167), which is about one inch long, with olivaceous brownish body, 

 clear hind wings and brownish fore wings that have an inconspicuous 

 longitudinal median series of black spots in the basal half (these spots 



