130 THE DEVELOPMENT OF INSECTS 



first division, or Heteromorphce as they are called ; 

 and the Hemiptera and Orthoptera into the 

 second or Homomorphce. The dragonflies are the 

 only slightly discordant elements in this arrange- 

 ment, as, although their larvae have six legs and 

 walk about under the water and never assume 

 an actual chrysalis condition, still they can 

 hardly be said to resemble their gorgeously 

 coloured parents which fly about so majestically 

 over our ponds, etc. ; still this is only one of the 

 many cases which show that nature cannot be 

 held down by any of the arbitrary rules we make 

 for her classification. 



The Hymenoptera are therefore characterized 

 and distinguished from other insects by having 

 both a biting and .sucking mouth, four clear wings, 

 and by passing through the distinctive liveries of 

 caterpillar or grub, and chrysalis or nymph. It 

 is with this order only with which we have been 

 dealing. To distinguish the aculeate section 

 from the many other forms of the Hymenoptera 

 is too complex a task to undertake here, but 

 the presence of a narrow waist between the 

 thorax and the body, the number of joints 

 in the antennae never exceeding thirteen in 



