22 



THE LAEYA. 



We have thus given an outline of the entire anatomy 

 or structure of larvce, and, according to their structural 

 features, we might group them on this plan : 



I. Larvag 



without lepfs. 



^ 



( 1. With a corneous or horny head of 

 determinate shape. 

 2. "With a membranaceous head of indeter- 

 minate shape. 



f 1. Joints short 



II. Larvae with legs. < 



I. JJ^ith legs only, with 



and conical. 



or without a ter- [ 2. Joints long 



I 

 minal proleg; I and subfi- 



t liform. 



II. Prolegs only. 



III. Both legs and ( "Without claws. 



prolegs. ( With claws. 



3. Shape or Figure. — From what has already been 

 given in relation to the anatomical structure of larv£e, 

 their general shape may be readily inferred to be cylin- 

 drical or vermiform, construcffed into rings or segments, 

 as if bound with a number of little bands or threads along 

 the body. These rings are usually twelve in number (ex- 

 clusive of head and terminal ring), and often, though not 

 always, of a uniform length. The general outline or 

 shape of the body, however, is extremely various, and a 

 knowledge of these forms can be gotten only from the 

 objects themselves, or from what is of next value, draw- 

 ings of them. 



