20 THE LARVA. 



or maxillc^^ hence called maxillary palpi., or situated on 

 the under-lip^ or lahimn, and called the labial palpi. In 

 many famiUes of the Dipterous and Hymenopterous in- 

 sects, however, they are either entirely wanting or are 

 quite rudimentary. 



The Trunk and Abdomen are not distinguishable from 

 each other, as they are among the perfect insects or Imago, 

 or even indeed as they often are among the pupse, but 

 among the larvc^ may be considered together. They are 

 composed in general of twelve segments, excluding the 

 head and the last or tail segment of the body. 



The first three segments correspond to the trunk or 

 thorax in the perfect insect, though they differ from the 

 other rings of the body only in being shorter and in hav- 

 ing the anterior six leg joined to them. 



The Tail, or last segment, however, varies the most of 

 any of the rings of the body. In many insects this tail 

 ring is obtuse and rounded, while in many others again it 

 is acute, truncate, or otherwise shaped. In some, also, it 

 is simple and unarmed, while in others, again, it is beset 

 with horns, spines, radii and tubercles of various forms. 



Tegs, — Of the larvae that do not resemble the adult in- 

 sect, we may say in general that those of the Coleoptera, 

 Lepidaptera and Neuroptera have legs, and those of the 

 Hymenoptera and Diptera have none. 



Larva of Bee (without legs). 



