LATREILLIAN ARRANGEMENT OF PUP^. 



197 



these, however, must be regarded only as exceptions, be- 

 longing in reality to the second, and not to the first section. 

 Latreille, to whom Entomology is so much indebted, dis- 

 tinguishes three species of metamorphosis, to which, with a 

 view to obviate the difficulties arising from the Fabrician 

 mode of nomenclature, he has apphed a different series of 

 names, calhng the first Metamorphosis inchoata, dimidiata, 

 and perfecta. The first of these terms is applied to wing- 

 less insects, such as the Scolopendrce, luli, &c., and in which 

 the variations of the larva and pupa states are so indistinct 



that the terms cannot with propriety be employed, the meta- 

 morphosis consisting occasionally of an increase in the num- 

 ber of limbs and rings (figs. 27, 28, magnified; and 29, 

 natural size, representing the growth of an lulus). In the 

 species undergoing the metamorphosis dimidiata, the dif- 



Fig. 30, Larva— 31, Pupa of the Groat green EngUsh Grasshopper. 



ferences are more observable; the larva {demi-larve La- 

 treille) is apterous, but the pupa {demi-nymphe Latreille) is 



s 3 



