INSECTS AFFECTING GRAINS, GRASSES, FORAGE 99 



Records of locust plagues in California date back as far as 

 1722. Many of them were doubtless due to the California 

 Devastating Locust (Melanoplus devastator Scud.), and in the 

 last invasion of 1885 this species outnumbered all others seven 

 to one. Resembling the last two 

 species in size and markings, the 

 habits and life history of this species 

 are also supposed to be similar to 

 them, though they have not as vet 



been thoroughly studied. Yl( f, f 65--Red - legged locust 



(Melanoplus femur - rubrum 

 Together with the last species Harr.). (After Riley.) 



the Pellucid Locust (Camnula 



pellucida Scud.) has been largely responsible for the losses occa- 

 sioned by locusts in California, and has also been found in New 

 England, but is not noted there as specially destructive. 



Our largest, winged Amer- 

 ican locust, the American 

 Acridium (Schistocerca ameri- 

 cana Scud.), is practically 

 confined to the Southern 

 States from the District of 

 Columbia to Texas, and thence 

 south through Mexico and 

 Central America, being rarely 

 found in the 'North. This 

 species is essentially a tropical 



rp,*' , one, and has often been ex- 



I-IG. 66. The pellucid locust (Camnula 



pellucida Scud.). (After Emerton.) ceedingly destructive, being 



especially so in 1876 in 



Missouri, Tennessee, North Carolina, Georgia, and southern Ohio. 

 Considerably larger than the preceding species are the Dif- 

 ferential Locust (Melanoplus differentialis Thos.) and the Two- 

 striped Locust (Melanoplus bivittatus Scud.), of which the former 

 is peculiar to the central States of the Mississippi Valley, Texas, 

 New Mexico, and California; while the latter has a more extended 

 range from Maine to Utah and as far south as Carolina and 



