1951] 
Creighton — Arizona Ants 
51 
Between some of the punctures it is thrown up into a low 
mound. There are no rugae on the front of the head unless 
one chooses to regard the mounds just mentioned in this 
light. As may be seen the head of the female does not re- 
semble that of the major of bruesi and still less that of the 
Text-fig. 2. Camponotus ( Myrmaphaenus ) ulcerosus Wheeler, head of 
female. Scale as in text-fig. 1. 
major of ulcerosus. There is, however, a very close resem- 
blance between the head of the female and that of the larger 
media workers which were taken with them. 
We may now consider the structure of the major workers 
taken with these females. The first female to be secured 
came from a colony which had been scattered by improper 
collecting methods. Only two majors were taken in this 
case. Both are transitional in the degree of development of 
the ulcers on their cheeks. That is to say, the ulcers are 
much shallower than those of the type of ulcerosus but still 
