PHYLUM ARTHROPODA 



3 2 9 



Anatomy and 

 Physiology. — The 

 honey-bee is a 

 highly specialized 

 insect and ex- 

 hibits adaptive 

 structures to a re- 

 markable extent. 

 It does not, how- 

 ever, illustrate 

 general anatom- 

 ical features as 

 well as some other 

 species, e.g. the 

 grasshopper (Fig. 

 249). An insect's 

 body consists of 

 three principal 

 parts, (1) head, 

 (2) thorax, (3) ab- 

 domen. The head 

 bears a compound . 

 eye on either side, 

 three simple eyes 

 (ocelli) and a pair 

 of antennae in 

 front, a frontal 

 piece called the 

 clypeus, and four 

 pairs of append- 

 ages constituting 

 the mouth-parts. 

 The thorax con- 

 tains three seg- 

 ments, — protho- 



