702 Bulletin American Museum of Natural History. [Vol. XXIII, 



developed, with pointed tips and about a dozen blunt basal teeth. Anterior border 

 of clypeus with two broad blunt teeth and a median excision. Space between frontal 

 and lateral carinse concave, elliptical. Antennae slender. Cephalic spines obsolete, 

 except those of the posterior occipital region, which are short, acute and sometimes 

 bent downwards at their tips. Thorax through the wing insertions more than twice 

 as broad as the head. Mesonotum as Inroad as long, projecting in front over the small 

 pronotum, which has a short, broad tooth at its inferior corner on each side. Scutel- 

 lum convex, with a faint longitudinal impression in the middle. Epinotum unarmed. 

 Petiole and postpetiole similar to those of the female, but each side of the former 

 sometimes with two spines of unequal length, and the postpetiole is less angular on 

 the sides. Gaster as broad as long, elliptical, convex above and below. Hypopy- 

 gium broader than long, fenestrate, with its free edge faintly bidentate and not ex- 

 cised but instead slightly produced in the middle. Outer genital appendages slender, 

 strap-shaped with subparallel borders and obliciuely truncated tips. Median pair 

 long with infolded edges and geniculate towards the apex, which is flattened and 

 provided with a strong basal and two feebler terminal teeth. Wings 22 mm. long. 



Mandibles somewhat shining, finely striate and coarsely punctate. Head and 

 thorax opaque, pedicel and gaster slightly shining. Clypeus, frontal area and facial 

 concavities uniformly granular, remainder of head coarsely reticulate-rugose. Thorax 

 rather coarsely granular and punctate. Mesonotum with undulating transverse 

 rugulae. Pedicel and gaster densely and finely punctate, with more scattered, larger 

 piligerous punctures. Legs and genitalia shining. 



Hairs fulvous brown, long, dense, and erect on the head and upper portions of 

 thorax and pedicel, sparser on the pleuree and legs; on the gaster much shorter and 

 sparser and hardly more than a dilute, suberect pubescence. Outer genital valves 

 and free edge of hypopygium with numerous hairs. 



Ferruginous brown; gaster, genitalia, legs and antennse somewhat paler. Wings 

 like those of the female. 



Texas: Chapel Hill, Brenham, La Grang'e, Ye Gua Creek (Lincecum); 

 Au.stin (Buckley, Lincecum, Tow'n.send, ]McCook, Wheeler) ; Alice, New 

 Braunfels, Elgin, Crranite Mountain (Wheeler). 



There exi.sts some confusion in the literature in regard to this species. 

 The European myrmecologists, ]Mayr, Forel and Emery, have confounded 

 it with a closely related, but in my opinion, perfectly distinct Mexican species, 

 A. mexicanci F. Smith {A. jervens Say). The soldiers and medise of the 

 latter, of which I possess specimens from Guadalajara (J. F. McClendon), 

 Irapuato (C. H. T. Townsend), Escjuinapa (J. H. Batty), Cuernavaca and 

 Queretaro (Wheeler), differ from the corresponding phases of texana in 

 having the head smooth, shining and hairless above. In the male the 

 hypopygium (PI. L, Fig. 25) is shorter, distinctly excised in the middle 

 with the blunt teeth further apart, and without a median fenestra. The 

 outer genital appendages are slender and taper to a sharp point; the middle 

 pair are more slender and flattened, less geniculate and more uniformly 

 curved. In PI. L, Figs. 21-25 are given camera drawings of the male 

 hypopygia of all the species of Atta s. str. except coJumhica (which is probably 



