WHEELER, NORTH AMERICAN ANTS 319 



kow), and several workers from Box Canyon in the same territory (A. G. 

 Uuthven). 



This species is readily distinguished from all our other Camponoti by 

 the peculiar shape of the cl3'peus in the worker and female phases. Its 

 other characters are, however, so much like those of the preceding forms, 

 notably C. ocreatus and vafer, that it must be included in the maculatus 

 group. The resemblance to ocreatus is even closer in the following sub- 

 species. 



19. C. acutirostris primipilaris subsp. iiov. 



WorTcer major. Length, 15 mm. 



Differing from the worker major of the typical form in its large size, in 

 lacking the deep, elongated foveolse and erect hairs on the cheeks and in 

 coloration. The whole head, including the scapes and first funicular joint of 

 the antennae, the tips of the femora, the whole of the tibije, the dorsal por- 

 tions of the pro- and mesonotum, black. 



Worker minor. Length, 10-11 mm. 



Resembling the worker major in sculpture, pilosity and coloration, but 

 without black on the dorsum of the pro- and mesonotum. 



Female. Length, 1&-17 mm. 



Like the worker major. Pro- and mesonotum, scutellum and metanotum 

 black ; pleurae, epinotum, coxae, petiole and femora brown ; gaster black, first 

 and also the second segment, except its posterior border, yellowish brown. 

 Petiole with the upper border more or less excised in the middle. Wings dis- 

 tinctly suffused with yellow ; veins and stigma brown. 



Described from a single worker major taken by C. E. Biederman at 

 Palmerlee, Arizona, 5500 ft.) ; six minor workers and a media taken by 

 W. M. Mann in Eamse}^ Canyon, Huachuca Mts., Arizona, and three 

 females taken by Dr. H. Skinner at Nogales in the same territory." 



This subspecies in the coloration of the antennas and legs closely re- 

 semble.s ocreatus, but it is readily distinguished by its larger size and by 

 its clypeal border which is angular and pointed like that of the typical 

 acutirostris. 



20. C. socius Roger 



Roger, Berlin Ent. Zeitschr., VII, p. 140, ^, 1863; Foeel, Bull. Soc. Vaud. 

 Sci. Nat, (2) XVI, p. 74, ^, 1879; Mayb, Verb. zool. hot. Ges. Wien, XXXVI, 

 p. 422, 9 , 1886 ; Dalla Torre, Catalog. Hymen., VII, p. 253, 1893 ; Emery, Zool. 

 Jahrb. Abth. f. Syst, VII, p. 670, 1893. 



Worker major. Length, 11-13 mm. ; head, 3.3 x 3.2 mm. ; scape, 3.5 mm. ; 

 hind tibia, 3.5 mm. 



" Since the above was written, I have found this subspecies very abundant in various 

 canyons of the Huachuca Mts. It nests under stones at altitudes of between 5000 and 

 6000 ft. 



