1951] 
Creighton — Arizona Ants 
49 
the head formed an almost flat plane which rounded into 
the lateral borders of the head through a blunt angle. The 
cheeks, clypeus and frontal lobes were coarsely but unevenly 
punctato-rugose (Text-fig. 3). It is not surprising that 
Wheeler considered these very different insects as distinct 
species or that Emery should later have placed them in 
separate subgenera. With nothing more than the structure 
of the types for a guide, this procedure required no justifi- 
cation. The accumulation of additional material of ulcerosus 
and bruesi was slow. Wheeler took two colonies of ulcerosus 
Text-fig. 1. Camponotus ( Myrmaphaenus ) ulcerosus Wheeler, head of 
major worker with fully developed ulcers. 
containing both major and minor workers in the Huachuca 
Mountains after he had described that species but before 
the paper carrying the description was printed. This ma- 
terial, which was referred to in a footnote, seems never to 
have been mounted for study. I believe that it must have 
been subsequently lost for I have never seen any of it in 
the collections which I have examined. It was not until nine 
