INTERNAL ANA TOMY. 



45 



21, larva of one of our New England species, en- 

 larged) resembles its parent, though differing in minor 

 details. The wings have not yet grown, 

 and therefore the thoracic rings (Fig. 

 21, b\ //', ^"') have not wholly as- 

 sumed the, modified structure of the 

 adult. The antennae {at) are shorter 

 and stouter than those of the full- 

 grown locust. Hundreds of these 

 larvae can be collected by sweeping 

 the grass in a sunny field with a net 

 during the latter part of June. In 

 July the pupae are abundant.. The 

 pupa (PI. II., Fig. 22 $ , Fig. 23 ?, of 

 Calopteuus^ Dodgei, p. 1,^) has the wings in the form of 

 sacs. These increase in size till the last skin is shed, 

 when they are fully developed. Contemporaneously 

 with the development of the wings the thoracic rings 

 become more complex in structure. The changes in 

 the ovipositor, illustrated by PI. II., Figs. 24, 25, 26, 

 have already been described (see pp. 2^?^, 34). The 

 three larval skins are usually shed on or near the 

 ground, in sheltered places protected by grass or 

 other vegetation. The two pupal moults generally 

 occur at a higher altitude, and the exuviae may be 

 found attached to tall weeds or posts. When the last 

 skin is shed, the locust has attained its full size. 



Fig. 21. 



1 This genus is now referred 



to Pezotetti 



