WHEELER: ANTS OF THE GENUS FORMICA. 423 
Hairs and pubescence grayish, both very abundant, covering the 
head, thorax, and gaster; the hairs erect and rather short, the pubes- 
cence very long; eyes, scapes, and legs hairless. 
Black; genitalia heavily infuscated; mandibles brown with yellow- 
ish tips; legs yellow, terminal tarsal joint of each foot black; wings 
uniformly gray, or smoky, with brown veins and black stigma. 
TYPE LocaLity.— Colorado: Canyon City (P. J. Schmitt). 
Colorado: Cotopaxi (P. J. Schmitt). 
New Mexico: Paraje, Las Valles (T. D. A. Cockerell); Alamogordo 
(G. v. Krockow). 
Arizona: Tucson, Benson (Wheeler); Tempe (T. D. A. Cockerell). 
Nevada: Las Vegas (J. C. Bradley). 
Texas: San Esteban near Marfa, Langtry, Ft. Davis (Wheeler); 
Eagle Pass (J. D. Mitchell). 
Mexico: Coahuila (A. F. Rangel). 
This ant is certainly not a form of subpolita, nor does it belong with 
fusca, as I formerly supposed. It is closely related to the preceding 
species (F. manni), but differs in the greater size of the worker and 
especially of the female, the more robust body and antennae, more 
convex mesonotum, more abundant and longer pilosity and pubescence. 
F. mannt might, perhaps, be regarded as a subspecies of perpzlosa. 
The notch in the clypeus of the worker of the latter species is shallower 
and less constant, especially in small individuals than in mann. 
Since the original account of this species was published ten years ago, 
I have had several opportunities of studying it in Arizona and Western 
Texas. It is preéminently a species peculiar to irrigated lands and 
river bottoms in the deserts of the southwest. There it nests in 
rather populous colonies about the roots of bushes or trees, often form- 
ing obscure craters or low mound nests, not unlike the nests of F. 
subsericea in the Eastern States. I have never found it nesting under 
stones. It is a very active and aggressive ant, and, as Herrera has 
shown, is of some little economic value as a boll-weevil exterminator. 
There is not the slightest indication that it is either a temporary social 
parasite or a slave-holder. 
19. F. BRADLEYI, sp. nov. 
WorKErR. Length 3.5-5 mm. 
Head, excluding the mandibles, a little longer than broad, a little 
narrower in front than behind, with straight sides and straight or 
feebly convex posterior border. Eyes rather large. Clypeus convex, 
carinate, its anterior border not produced, broadly rounded, with a 
very shallow, broad excision in the middle. Frontal carinae subparal- 
