322 



Margaret Holliday. 



tubules to eacli side. The receptaciüum is present in the usual 

 Position (Fig. P). 



The worker phase here is represented by soldiers, macroergates 

 and microergates. The soldier has only one tubule to a side, with 

 one egg, er at most two, to a tubule. The accessory gland is present 

 here also, situated between the ovary and the anal gland. 



The macro- and micro-ergates also have only one tubule to a 

 side, and one egg in each. The accessory gland is present in 

 both forms. 



JPoffononiyrmex barbatus Smith var, molifaciens Buckley. 



Although the nest of this ant is so abundant and although the 

 young queens niay be obtained in great numbers during the marriage 

 flight, it is very difficult to obtain a queen that has presided over 

 a colony, as the nests are so large and the queen located at such 

 a depth in the immense nest. However, one of these queens, which 

 had been at the head of a very large colony, was obtained this 

 spring. 



The ovaries of this queen were large and well developed, 

 possessing from twenty-five to thirty tubules to a side, witli about 



fifteen eggs in each tubule. The ovary 

 resembled very much that of C. macu- 

 latus sansabeanus with the exception 

 of the increase in the number of tubules. 

 The receptaculum seminis was 

 large and bilobed; the ovary was 

 3.2 mm long. 



The workers showed a great' re- 



duction in the number of tubules, the 



highest number reached being seven 



on one side; usually the number is 



less. Although the workers dissected 



showed no external differences, sixteen 



ovaries possessed the receptaculum 



seminis, while nineteen did not. The receptaculum of tlie workers 



did not sliow the bilobed structure, but was a simple spherical sac 



(Fig. Qa and b). 



The following table fpage 323) gives the Variation in the number 

 of tubules in the workers. 



Fig. Q. 



Pogonomyrmex barhatus Smith 

 var. molifaciens Buckley. 



a and b Ovaries of workers, pos 



sessiiig a typical receptaculum 



seminis. 



