1652] 
Creighton — Camponotus papago 
151 
dividuals. One of these was a dealated female, three were 
major workers and four were minor workers. The nest 
was found in a dead limb of Quercus emoryi. As soon as 
possible I took this nest to Harvard for comparison with 
material identified as cerberulus in the Wheeler Collection. 
This was put at my disposal through the courtesy of Dr. 
Joseph Bequaert whom I wish to thank for this kindness. 
The material labelled as cerberulus in the Wheeler Collec- 
tion consisted of Skwarra’s specimens from Vera Cruz 
and a series of females from Texas Pass in the Dragoon 
Mountains. To save possible confusion in the future it 
seems well to note that on the locality labels of these speci- 
mens the name is mispelled as the “Dragon Mountains”. 
Texas Pass is a low pass at the western end of the Dragoon 
Mountains, through which the highway between Willcox 
and Benson now runs. The specimens from Sabino Basin 
and Black Dike Prospect, which Wheeler mentioned in 
1934 could not be found. It is probable that these speci- 
mens are now in the collection of the American Museum 
of Natural History. 
As I had expected, the female from Garden Canyon 
proved to be identical with those from Texas Pass. But 
the Garden Canyon majors were not the same as those 
from Vera Cruz. I have presented the differences in detail 
on a subsequent page. They need not be discussed here 
other than to state that, in my opinion, these differences 
clearly show that the two insects belong to separate species. 
While the above comparison does not cover the second 
part of Wheeler’s double association, it has given results 
significant to it. The head of the major of Colobopsis, 
like that of most species of ants in which this caste is 
present, differs more or less from that of its accompanying 
female. But there is no rule which governs the degree of 
difference. The amount of differentiation varies with the 
species and this circumstance defeats any attempt at 
anticipating the finer structure of one caste from that of 
the other. Since this is the case it should be obvious that 
nothing can be done with cerberulus until the unique female 
type can be proven identical with a female whose major 
worker is known. That this could be done by using Emery’s 
