PHYLUM ARTHROPODA 



635 



This order includes Fleas, Gnats, and Mosquitoes (Fig. 511), 

 House-Hies and Blow-flies, Bot-flies (Fig. 512), Crane-flies, and 

 " Daddy-long-legs." 



Fig. 513. — Butterfly (Pieris), with caterpillar and chrysalis stages. (After Gu^riiiand Percheron.) 



Orj)ER 6. — Lepidoptera. 



Insects with both pairs of wings well developed and covered 

 with scales (modified hairs). The maxillae are modified to form 

 an elongated sucking tube, which can be 

 rolled up spirally ; the other parts of the 

 mouth are rudimentary, with the ex- 

 ception of the labial palpi. The pro- 

 thorax is fused with the mesothorax. 

 The metamorphosis is complete. 



This order includes Butterflies (Fig. 

 513) and Moths. 



Order 7. — Coleoptera. 



Insects in which the anterior pair of 

 wings take the form of hard horny 

 wing-cases, or elytra, which, when at rest, 

 are folded up along the back and cover 

 over the folded-up membranous pos- 

 terior wings. The prothorax is movable 

 on the other segments. The jaws are fully 

 developed, and adapted for biting and chewing. The metamor- 

 phosis is complete. 



This order includes the true Beetles (Fig. 514). 



Fig. 514.— Beetle (Crioceris) 

 with larva. (After Guferin 

 and Percheron.) 



