184 



^A^ INTRODUCTION TO ENTOMOLOGY 



Among the many types of larvs, there are a few that are of such 

 common occurrence as to merit distinctive names; the more im- 

 portant of these are the following: 



Campodeiform. — In many paurometabolous 

 insects and in some holometabolous ones, the 

 early instars resemble Campodea more or less in 

 the form of the body (Fig. 202); such naiads 

 and larvae are described as campodeiform. 



In this type, the body is long, more or less 

 flattened, and with or without caudal setae ; the 

 mandibles are well developed; and the legs are 

 not greatly reduced. Among the examples of 

 this type are the larvae of most Neuroptera, and 

 the active larvas of many Coleoptera (Cara- 

 bidas, Dysticidas, and the first instar of Me- 

 loidae). 



Eruciform. — The eruciform type of larvae is 

 well-illustrated by most larv« of Lepidoptera 

 and of Mecoptera; it is the caterpillar form 

 (Fig. 203). In this type the body is cylindrical; 

 the thoracic legs are short, having only the 

 terminal portions of them developed; and the 

 abdomen is furnished with prolegs or with 

 proleg-like cuticular folds. Although these 

 larvae move freely, their powers of locomo- 

 tion are much less than in the campodeiform 

 type. 



Scarabeiform. — The common white grub, the larva of the May- 

 beetle (Fig, 204) is the most familiar example of a scarabeiform larva. 



Fig. 202. — Campodea 

 slaphylinus (After 

 Lubbock). 



Fig. 203. — The silk-worm, an eruciform larva (After Verson). 



In this type the body is nearly cylindrical, but usually, especially 

 when at rest, its longitudinal axis is curved ; the legs are short ; and 



