20 



BRITISH ANTS. 



cells, their ducts opening on the dorsal membrane below the seg- 

 ment, and others are found on the ventral membrane. 



The poison apparatus is a complicated structure made up of the 



Poison glands 



Sting 

 sheath 



Fig. 35. Poison apparatus of Boihriomyrmex meridionalis Q 

 (a Dolichoderine ant). (Forel.) 



poison glands, the vesicle, or poison sac, the duct of the vesicle with, 

 or without, a sting, and the accessory gland. This apparatus occurs 

 in the workers and females of all ants, and is situated in the posterior 



Bonrrelet 



Accessory 

 gland 



Fig. 36. Poison apparatus of Myrmica laevinodis ^. (Forel.) 



