BRITISH HIVE- BEE. 



321 



The circulatory system is in essentials the same as that 

 of the cockroach. The blood contains a few nucleated 

 amoeboid corpuscles. 



The excretory system consists of numerous fine Mal- 

 pighian tubules which open into the small intestine. 



Reproductive system. In the drone the reproductive 

 organs consist of a pair of testes, each furnished with a 



FIG. 1^9. Hive Bees and the Cells in which they develop. 



P.. drone cells ; W., worker cells ; Q., queen cell, open and closed ; 

 cf., drone ; ?v. , worker; y., queen. 



narrow vas deferens, expanding at its distal end into a 

 seminal vesicle. The seminal vesicles open into the ejacu- 

 latory duct, and at their junction a large paired mucus gland 

 opens. When maturity is reached, the testes diminish in 

 size, while the spermatozoa accumulate in the terminal 

 expanded part of the ejaculatory duct, and there become 

 aggregated into a compact spermatophore. With the ter- 

 minal portion of the male duct copulatory organs are 

 associated. 



21 



