1903.] NATURAL SCIENCES OF PHILADELPHIA. 247 



posteriorly it is nearly smooth and shining. Pleura^ and cpinotiim 

 with rather coarse, distinctl)^ longitudinal rugae. Epinotal spines small, 

 acute, straight. Petiole with pointed node and more abruptly decliv- 

 ous posterior slope than in the worker, its dorsal surface scarcely 

 flattened. Postpetiole very convex in front above. Sculpturing of 

 petiole and postpetiole as in the worker. Color of head, thorax and 

 pedicel reddish-brown, darker on the dorsal surface. Gaster black. 

 Pilosity of body and legs and color of the latter much as in the worker. 

 Wings whitish-hyaline; veins and stigma yellow. 



Male. — Length 2-2.5 mm. 



Head exclusive of the mandibles broader than long, cheeks short, 

 posterior angles convex and rounded. Mandibles overlapping each 

 other. Antennae 13-jointed; scape as long as the first four joints of 

 the funiculus, club very distinct, 4-jointed, the first, second and third 

 subequal, fully H times as long as broad, apical joint as long as the 

 second and third together; first funicular joint somewhat swollen, 

 fully Ih times as long as broad; joints 2-8 longer than broad. Epino- 

 tum with two very small, indistinct protuberances in the place of the 

 spines. Petiole slender, in profile concave below; anterior dorsal 

 slope nearly straight, gradual, posterior slope shorter, abruptly de- 

 clivous, rather concave. Postpetiole campanulate, about as long as 

 broad; H times as broad as the petiole. Legs long and slender. 



Mandibles striated. Clypeus coarsely and irregularly reticulate- 

 rugose, shining. Head subopaque, evenl}^ and rather delicately reticu- 

 late-rugose. Neck finely reticulate; mesonotum shining, with a faint 

 reproduction of the irregular rugosity of the worker; remainder of 

 thorax and the pedicel delicately reticulate-punctate. Gaster smooth 

 and shining. 



Hairs white, non-clavate, long and moderately abundant on the 

 mandibles, pedicel and gaster; sparser elsewhere. 



Black; mandibles and genitalia yellow; antennal funiculus grayish- 

 brown; wings like those of female; legs like those of the worker in color. 



Type locality: Milano, Millan County, Tex. 



All three sexual phases of this species were taken May 23, 1902, in 

 nests consisting of a few small galleries, 3-4 inches long, excavated in 

 .the sand in rather damp spots under post-oaks and cedars. 



13. Leptothorax tricarinatus Emery. 



L. tricarinatus Emery, Zool. Jahrb. Abth. f. Syst., VIII, 1894, pp. 318, 

 321, 322. 5. 



Worker (PI. XII, fig. 17). — Length 2.25 mm. 



Clypeus produced in front in the middle, obtusely angulate, above 



