352 ANNALS NEW YORK ACADEMY OF SCIENCES 



Head opaque; occiput and posterior angles shining; the truncated anterior 

 portion, including the mandibles, clypeus, the portions of the cheeks within 

 the ridges and the anterior portion of the front, uneven and irregularly rugose ; 

 remainder of the head covered with dense, uniform punctures and more scat- 

 tered and rather deep foveolse, which are slightly elongated on the cheeks out- 

 side the ridges. Thorax, petiole, gaster and legs densely punctate, more shin- 

 ing than the anterior portion of the head, less so than its posterior corners. 

 In addition to the dense punctures, the surfaces of these parts are covered 

 with coarse, scattered piligerous punctures. 



Hairs glistening white, erect, abundant; longest on the gaster, petiole and 

 thorax, shorter on the head; blunt on the cheeks and sides of the head. 

 Antennse with short, delicate, erect hairs on the anterior surfaces and tips of 

 the scapes. Hairs on legs sparse, rather long and oblique or suberect. Tibiae 

 without bristles on their flexor surfaces. Pubescence apparently lacking. 



Black; mandibles, clypeus, front and cheeks to a little outside the ridges 

 which bound the truncated surface, yellowish brown ; posterior edges of gastric 

 segments, antennae and tarsi, except the first joint, dark brown, antennal 

 scapes somewhat paler and more reddish towards their bases. 



Described from a single specimen taken by Mr. C. Schaeffer at Palmer- 

 lee, Hiiachuca Mts., Arizona. 



This remarkable species differs from all our other North American 

 Camponoti in the peculiar structure of the head, which shows a decided 

 resemblance to certain species of Colohopsis and furnishes additional 

 proof, if it were needed, that this group cannot be defined with sufficient 

 precision to constitute a genus. Except in the structure of the head, C. 

 ulcerosus is very closely related to C bruesi and C. frontalis Pergande. 

 Indeed, the worker minor of ulcerosus must be almost indistinguishable 

 from that of hruesi. although it probablv differs in having a higher and 

 more angular epinotum.'^ 



B. SUBGENUS COLOBOPSIS MA7R 



As I have given a full description of our jSTorth American species of 

 this peculiar subgenus and of their habits in a paper published several 

 years ago,^ I may here confine myself merely to enumerating the different 

 forms with their synonymy and habitats and to describing a new variety 

 which has come to light more recently. 



54. Camponotus (Colobopsis) abditus Forel var. etiolatus Wheeler 

 Wheelee, Bull. Amer. Mus. Nat. Hist., XX, p. 150, ^ 2 $, 1904, 



^ I recently found two colonies of C. ulcerosus in the type locality (Miller and Carr 

 Canyons, Huachuca Mts.). These colonies were nesting in the ground under large 

 stones at altitudes of 5500 and 6000 ft, respectively. The minor worker, which will 

 he described on another occasion, is, as I surmised, very much like that of C. bruesi. 



8 "The American Ants of the Subgenus Coloiopsis," Bull. Amer. Mus. Nat Hist, XX, 

 pp. 139-158, 7 figs., 1904. 



