INSECTA 



113 



Habits and Habitat. — Insects vary in their habitat. Most 

 of them are terrestrial, some are aerial, others are aquatic, a 

 few even being marine, while still others are su])terranean. 



iabrom \^x) 



JpleurTf 



Fig. 85.— External anatomy 

 disjointed: up, Uroi)ata<iiiun; 

 Kingsley.) (From Packard's 



>f ('(iloptc'mts spre'tus, the iiead and thorax 

 f, funnila; c, cercus. (Drawn bv J. S. 

 Zoolofry," Henry Holt & Co., Publishers.) 



Some are diurnal, as our common butterflies; others are noc- 

 turnal, as the bed-bug; some, crepuscular, as the moths. Some 

 are solitary ; others gregarious, or social, as the ants and bees. 



Plan of Structure (Fig. 85). — The insect body is divided into 

 three well-marked regions — the head, thorax, and abdomen. 



