274 



INJURIOUS INSECTS 



then travel during the warmer hours of the day by alter- 

 nately walking and hopping in vast bodies in some given 

 direction. In thus travelling they move at the average 

 rate of about three yards a minute. There are six stages 



Fig. 160. — THE LAKV^ AND PUPA OP LOCUST, 

 o, a, Newly-hatclied Larvae ; b. Full-grown Larva , c, Pupa of the Locust. 



of growth, i. e., the locust moults at five different periods. 

 The change at each of these moults is but slight, and the 

 wing-pads are first distinctly noticeable and turned up in 



Fig. 161.— THE PUPA OP THE LOCUST ACQUrEING WINGS. 



a, Pupa with skin Just split on Ibe back ; 6, the Imapo extruding ; c, the imago near- 

 ly out ; d, the Imago with wings, expanded. 



the fourth stage, or after the third moult. After the 

 fourth moult we have the true pupa stage (fig. 160, c), 

 and with the fifth moult the wines are acquired, the pro- 

 cess being illustrated at figure 161. The time required 



