1903] WHEELER:— TEXAN FORMICIDAE IO5 



infuscated. In many specimens the gaster and head are dark brown or bhick; usuallj in 

 mature specimens the gaster is darker than the head, tlie head darker than tiie thorax. 



Female. Lengtli 3-4 mm. 



Mandibles 6-toothed, shaped like those of the worker. Cljpeus very prominent in the 

 middle, siibcarinate, its anterior border feebly excised in the middle. Head, exclusive of the 

 mandibles and clypeus, distinctly broader than long, and narrower in front than behind. 

 Antennae like those of the worker. Thorax broader than the head, with flattened mesonotum 

 and scutellum. Epinotum regularly convex above, its basal surface very short, its declivity 

 somewhat flattened but not concave. Petiole like that of the worker. Gaster of the usual 

 shape in females of Prenolepis. 



Surface of body and appendages opaque, except the declivity of the epinotum which is 

 polished and shining. 



Grayish yellow pubescence covering the insect more abundant and longer than in the 

 worker. The long hairs, corresponding to those of the worker, are relatively shorter, less 

 obtuse and of a pale color like the pubescence. 



Body dark brown, antennae, legs, lower surface and sides of head, mesonotutw, and 

 scutellum reddish. The coxae, femora, and tibiae are sometimes slightly infuscated. Wings 

 yellowish gray, rather opaque with yellowish brown nervures and stigma. 



Male. Length 1.5-2 mm. 



Mandibles well developed, but edentulous. Clypeus like that of the worker but shorter 

 and with more distinct median incisure. Head, except for the much larger eyes and the 

 ocelli, somewhat like that of the worker in shape. Antennal scape reaching for nearly half 

 its length beyond the posterior corner of the head. Mesonotum broad, rounded and convex 

 in front, but depressed just in front of the very convex scutellum. Basal surface of epino- 

 tum rather long, flattened; the declivity- perpendicular. Petiole thicker and blunter above 

 than in the worker. Outer genital appendages triangular, tapering, longer than broad, a 

 little recurved so that their anterior border is convex, the posterior concave. Median 

 appendages bifurcated, short, the inner ramus broadly club-shaped at the apex, papillose on 

 its external border; lateral ramus digitiform, much shorter than the inner ramus, with its 

 end papillose. Inner genital appendages long, triangular, with a rounded knob at the some- 

 what recurved apex. When /« situ the tips of these appendages may project beyond the 

 larger external pair. Legs long and slender, wings like those of the female. 



Head, thorax, and abdomen smooth and shining, the surface delicateh' reticulate. 

 Antennae and legs more opaque. 



Pubescence and pilosit}' as in the worker, except that the erect hairs on the body are 

 relatively shorter, more tapering, and less conspicuous. The hairs on the outer genital 

 appendages, though numerous, are not more prominent than those on the gaster. 



Coloration like that of the worker except that the gaster is darker, and usually quite 

 black ; the head is dark brown, the thorax somewhat paler. Antennae and legs more or less 

 infuscated. Outer genital appendages dark brown, median and inner pairs pale yellow. 

 Wings colored like those of the female but with very pale and indistinct nervures. 



Described from numerous specimens of all the sexual forms from the following 

 localities : San Angelo, Tom Green County ; Austin and environs, Travis County ; 

 New Braunfels, Comal County, and Fort Davis, Jeff Davis County. I have also 

 received this species from Mr. C. H. Tyler Townsend who collected it in Mexico on 

 the Rio Santa Maria and at Cerro del Chilicote, Chihuahua. 



