THE CANADIAN ENTOMOLOGIST. 193 



Melanoplus devastator, Scudd. 



A third species of the genus Melanoplus is the one that occasionally 

 appears in destructive numbers in portions of California and the adjoining 

 States. It is about the same size as the atlanis just mentioned, and often 

 does considerable injury to the crops of the regions where it occurs. 

 Although this locust is know to inhabit almost the entire region lying to 

 the west of the main divide of the Rocky Mountains, and to reach even 

 beyond in Montana and Colorado, it has never, to my knowledge, been 

 injurious except in Nevada, California, Arizona and Oregon. This species 

 also occurs in two forms, viz., small and large, being the spring and fall 

 broods as nearly as I have been able to decide from specimens in col- 

 lections. 



Alelanoplus bivittatus. Say. The Two-striped Locust. 



This is our common species of " native grasshopper " all over the 

 country, and the one that so frequently becomes injurious to our gardens 

 and about the edges of fields. It occurs from the Atlantic to the Pacific, 

 and from the Gulf of Mexico to the Saskatchewan. Its increase in 

 destructive numbers appears, however, to be confined chiefly to the 

 regions lying between the Rocky Mountains and the Atlantic. This 

 locust also appears to vary considerably in its size and colour. There are, 

 however, two well-defined forms of it, the one receiving the name bivit- 

 tatus and the other going by that oi femoratus — the latter occuring only 

 northward. 



Melanophts differentialis, Thos. The Differential Locust. 



Next to the species just mentioned we frequently find a second species 

 of our large native locusts appearing in destructive numbers. This latter 

 species occurs in the Western and Middle States only, and is here very 

 often known to become unduly numerous and destructive to both field 

 and garden crops. It has been reported at different times to have been 

 present in such numbers in portions of Illinois, Indiana, Missouri, 

 Kansas, Iowa and Nebraska. A melanistic or black form of it is quite 

 frequent in portions of Nebraska and Kansas ; but otherwise it is quite 

 permanent in its characters. 



Melanoplus pofiderosus, Scudd. The Ponderous Locust. 



An insect very closely related to the preceding is that known to the 

 entomologist by the above name. It is a native of several of our Southern 

 States, and has on several occasions been the depredator of crops in por- 

 tions of central Texas. As the name would imply, it is of robust form, 

 and it has a somewhat similar appearance to differejitialis. 



