332 



ZOOLOGY. 



is voracious, and leads a different life from the qui .it, 

 sleeping pupa or chrysalis, which takes no foo" n the 

 other hand, the imago or butterfly has mundi 1 hich 



are rudimentary, and incapable of biting, while --ixillw, 

 or "tongue," which were rudimentary in the jrpillar, 

 become now greatly developed ; and the butterfly takes 



Fig. 296. Embryo of I 

 Water-beetle (Hydrophilus). E 

 gg ; K, head ; oi, upper lip: m 

 mouth ; an, antennae ; k,. man 

 dibles; # a , k,, maxillae; B 

 thorax ; ftj, 5 2 , o ? , legs ; h^-h,, 

 ten pairs of rudimentary abdc 

 minal legs, of which all except A, 

 disappear before the insect 

 hatches ; a, anus, After Kowa- 

 levsky. 



BM 



Fig. 297. Profile view of embryo 

 Honey-bee, lettering as in Fig. 

 296. BM, nervous cord; oG, brain; 

 Z>, digestive canal ; sch, the oeso- 

 phagus ; St, stigmatal openings of 

 the trachea! system ; X, heart. 

 After Blutschli. 



liquid food and but little of it, while its surroundings and 

 TO ode of life are entirely changed with its acquisition of 

 wings. Thus the butterfly leads three different lives, differ- 

 ing greatly in structure, externally and internally, at these 

 three periods, and with different environments. 



