THE THORAX AND ITS APPENDAGES. 



53 



Ant 



ten 



epipharynx which kept it moist and capable of absorbing odor 

 particles, while he ex- 

 plained the inhalation 

 of the latter into the 

 preoral cavity as 

 brought about through 

 the contraction of the 

 air sacs situated about 

 the mouth. Wolff's 

 anatomical researches 

 are without doubt 

 some of the best ever 

 made on the bee, and 

 it is due to his mis- 

 taken idea of the loca- 

 tion of the sense of 

 smell, which, as al- 

 ready explained, is on 

 the antenna', that we 

 have received from 

 him a most excellent 

 account and detailed 

 drawings not only of 

 the epipharynx but of 

 the mandibular glands, 

 the mouth parts, the 

 salivary " pump," and 

 the respirator}'' organs. 



IV. THE THORAX AND 

 ITS APPENDAGES. 



1. THE STRUCTURE OE 

 THE THORAX. 



The apparent thorax 

 of the bee (fig. 20, 

 T^-IT, and fig. 21) 

 and of most other 

 Hymenoptera is not 

 exactly the -equivalent 

 of the thorax in other 

 insects. The middle 

 division of the body, 

 so conspicuous in this 

 order, consists not only of the three leg-bearing segments, which alone 



Fig. 20.- 



-Dorsal view of ventral walls and internal skele- 

 ton of body ot worker. 



