56 



INSECTS. 



turn, it is cracked from within, and the butterfly comes 

 forth. 



All true insects, as has been said, undergo these three 

 changes, but their condition in the imperfect stages is 

 not alike in all, nor will the terms caterpillar and chry- 

 salis always apply to them. We must therefore use the 

 scientific names of Larva* for the second or Caterpillar 

 stage, and Pupa-f for the third or Chrysalis stage ; the 

 perfect insect is usually termed the Imago. 



Both the larvae and the pupae differ greatly in habit 

 and in appearance, in the various orders. The larva 

 j,j 25 may be a footless and almost in- 



active maggot, and even in some 

 cases (as with the social bees, see 

 fig. 25, and ants) be dependent 

 for food upon the care of the 

 parent or nurses. Other larvas 



are active and ravenous, and as 

 Larva of Bee. unlike the perfect ingect &g pog . 



sible, as in the case of the water-beetles (fig, 26) ; whilst 



in others, as the earwig, grasshopper, cockroach, &c., 



Fig. 2t>. 



Larva of Water-beetle (Dyticus). 



* From the Latin word larva mask, 

 t From pupa, a child referring to the swathing-bands of infants. 



