210 ARTHROPODA 



continued and how deep the sting is worked in. This should 

 remind you that a sting should be removed immediately, and 

 that it should not be pulled out, as grasping the poison sac 

 will aid in injecting the poison, but scraped off with a finger- 

 nail or rubbed off. 



A drawing showing the mechanism of the sting is desir- 

 able. 



Field: A Study of an Ant. Proc. Acad. Nat. Sci., Philadelphia, 1901. 

 Philips: A Review of Parthenogenesis. Proc. Am. Phil. Soc, 42, 1903. 

 Root: A, B, C and X, Y, Z of Bee Culture. 



