1914.] 



NATURAL SCIENCES OF PHILADELPHIA. 



543 



tergum and sternum (fig. 1, ECan). The diameter of the canal is 

 greatest at the median line of the abdomen and gradually diminishes 

 to zero at each end. 



Fig. 1.- — Diagram of a transverse-longitudinal view of end of abdomen of a 

 worker honey bee, showing the internal anatomy of the fifth and sixth 

 segments, and also the scent-producing organ composed of the articular 

 membrane {ArtM), the canal {Can), chitinous tubes (Tw) and gland cells 

 (GIC). The last segment is bent downward more than ever seen in the 

 living bee. That is, in the living bee only the part marked ArtM is seen 

 externally and the canal (Can) is never seen. 



