CHAP. IX. DESCRIPTION OF THE ORDER OF INSECTS. 



53 



Fig. 149. 



mations are. complete, and 

 the various members of the 

 pupa are enclosed in a 

 common sheath or cover- 

 ing (as the pupa of the 

 Achemon Sphinx, Fig. 149). A few of the larvae of the 

 smaller species of Moths are destitute of legs; others are pro- 

 vided with ten legs (as the Spring Canker-worm, Fig, 151, /); 



Fig. 150. 



Fig. 151. 



some with twelve legs (as the Fall Canker-worm. Fig. 151, /); 

 the greater number have sixteen legs (as the larva of the 

 Achemon Sphinx, Fig. 152); while a few of small size, which 



mine : e leaves of plants, have more than sixteen legs; in all 

 of the n the head is distinct. They are all more or less 

 injurious, with the single exception of one species (the Dak- 

 ruma coccidivorella of Comstock), which feeds upon young 

 Scale- insects. 



^HEMIPTERA (True Bugs), These insects are generally pro- 

 vided with four wings, but a few kinds have only two, while 

 others are entirely destitute of wings. The mouth is fitted for 

 suction, and is commonly called the "beak," or "proboscis." 

 (See the Dotted-legged Plant-bug, Fig. 19, r; the Spined Soldier- 



