318 A^XALS XEW YORK ACADEMY OF SCIENCES 



Waikcr 1)1 i nor. Length, 7.5-9 mm. 



Head longer than broad, with straight parallel sides, postoeular portioia pro- 

 longed and rounded, but distinctly narrowed at the occiput. Clypeus like that 

 of the worker major, but the point in the middle of the anterior margin is 

 more obtuse and less projecting. Antennae very slender. Thorax through the 

 pronotum about as broad as the head. Epinotum low, with its base twice as 

 long as the declivity into which it passes without a perceptible angle. Petiole 

 thick and rather conical, with blunt, entire lateral and dorsal border. 



Sculpture and pilosity much as in the w^orker major. Cheeks with a few 

 scattered, erect hairs. 



Dull yellow ; mandibles and cheeks brown ; sides and posterior portions of 

 head darker ; dorsal surface of gaster, with the exception of the posterior 

 edges of the segments, light brown. Antennal scapes and tarsi brownish. 



Female. Length, 13 mm. 



Resembling the worker major in sculpture, pilosity and color. Head nar- 

 rower, with straighter, more nearly parallel sides. Epinotum with convex, 

 rounded base, nearly as long as the declivity. Petiole broad and thick, com- 

 pressed antero-posteriorly near the margin, which is sharp. Thorax smooth 

 and shining, epinotum opaque and shagreened ; scutellum. metanotum and 

 pronotum, except for a large anteromedian blotch, dark brown or black. 

 Wings long (15 mm.), scarcely tinged with yellow near the costal margin; 

 veins brown, stigma blackish. 



Male. Length, 10 mm. 



Head very small, longer than broad, occipital border straight, not broader 

 than the anterior border and equal to the surface on each side between the 

 posterior orbit and the corresponding end of the occipital border. This surface 

 is not convex, but flat. Cheeks subparallel, straight, not concave. Clypeus 

 with broadly rounded border and reflected edge. Mandibles indistinctly biden- 

 tate. Thorax through the insertions of the wings nearly twice as broad as 

 the head, narrowed behind, with the epinotum as long as broad, rounded and 

 sloping in proflle, without distinct basal and declivous surfaces. Petiole very 

 low, thick and blunt, as long as high. Gaster, antennse and legs long and 

 slender. 



Mandibles and head subopaque, very finely shagreened ; clji^eus, cheeks and 

 front with a few coarse punctures. Thorax shagreened like the head, sub- 

 opaque in front ; scutellum, epinotum and gaster smooth, shining, more finely 

 and superficially shagreened. 



Hairs pale, short, erect and sparse, most abundant on the gaster, absent on 

 the scapes and tibiae, present in a single row on the flexor surfaces of the 

 femora. 



Black ; mandibles, distal portion of antennal scapes, genitalia and tarsi 

 brown ; articulations of thorax, gaster and legs whitish. Wings whitish hya- 

 line, with pale yellow veins and brownish stigma. 



Described from numerous workers, one female and one male taken 

 from a single colon}'- living in the ground under a stone at Alamogordo 

 in the foot-hills of the Sacramento Mts. of New Mexico (G. von Kroc- 



