HOW TO KNOW THE IMMATURE INSECTS 



lb. If mouth parts of chewing, rasping, or piercing and sucking types, 

 they are not retracted within head; if retracted the mouth parts 

 are usually hook-like (legless maggots) or of usual sucking type 

 (Anoplura, etc.); legs ordinarily present, tarsi composed of 1 to 5 

 segments, when one-segmented, possessing only one claw; wing 



SriE^NVM 



Fig. 47. a. Head of Harpalus vagans LeConte with chewing 

 mouth ports; b, Head of a thrips with piercing and 

 /osping mouth parts; c, Lateral aspect of the thor- 

 ax of a damselfly; d, Piercing and sucking mouth 

 parts; e, Head of a maggot and mouth hooks. 



pads present in some orders, when present the sides of the thor- 

 acic segments and sterna are usually divided into smaller scler* 

 ites; all appendages absent among some larvae and puparia. 

 Fig. 47 4 



Fig. 48.. Microen- 

 tomon perposHlom. 



2a. Antennae absent. Fig. 48 



Order PROTURA page 54 



The members of this order are very minute, slend- 

 er, whitish, wingless insects with retracted mouth 

 parts, no eyes but with a pair of pseudoculi, pointed 

 head, nine-segmented abdomen in young and twelve- 

 segmented abdomen in adult. Less than a hundred 

 species have been described. 



29 



