ECONOMIC ENTOMOLOGY. 73 



The eggs in the mass are placed in four rows, that part 

 toward the surface which will allow the newly hatched in- 

 sects to emerge head-foremost. 



The masses are generally placed in hard and compact 

 earth in preference to that which is loose or sandy. 



When the locusts are plentiful, the females may even 

 be found boring into the hard soil of a well traveled street. 



The young locusts resemble the adults in every respect 

 except that i.hey have no wings. 



In a few hours after hatching they begin to feed on 

 whatever appropriate food they find near them. 



P. Spretus. 



They develop rapidly, moulting or casting their skin 

 repeatedly, until they attain the adult state, the wings ap- 

 pearing at the second or third moult. 



The locusts devour all varieties of vegetation, and great 

 destruction is attendant on their appearance. 



The common red-legged species (Pezotettix (Caloptenus) 

 femur-rubrum, De Greer), prefers to feed upon grasses in 

 open areas, while the Rocky Mountain Locust (P. spretus, 

 Thomas), a closely allied species, differing principally in 

 having longer wings, feeds upon any plant that comes in 

 its way. 



Remedy. The most effectual remedy has been demon- 

 strated to be the kerosene emulsion (see next chapter). 



Note. The following paragraphs on the locusts, from 



