WHEELER, NORTH AMERICAN ANTS 313 



posterior surface and. rather sharp border. Gaster of the usual shape. Legs 

 slender ; middle and hind, femora scarcely compressed, elliptical in cross-sec- 

 tion, not sulcate. 



Mandibles shining, sparsely punctate. Head rather coarsely, thorax and 

 gaster more finely shagreened, so that the head, especially in front, is opaque 

 or subopaque, its posterior corners, the thorax and, especially the gaster, more 

 shining. Whole of head, except the spaces between the eyes and the frontal 

 ca rinse, covered with sparse, elongate foveolse, which are deepest and largest 

 on the cheeks, clypeus and front. 



Hairs tawny yellow, abundant and erect on all parts of the head and. gaster, 

 thoracic dorsum, fore coxae and petiolar border. Femora with a few scattered 

 erect hairs on their flexor and posterior surfaces ; tibise with very short slant- 

 ing hairs ; middle and hind pairs without graduated bristles on their flexor 

 surfaces. Antennal scapes with short, erect and delicate hairs, in some speci- 

 mens abundant, in others very sparse or almost absent. Fringe of hairs on 

 the clypeal border short. Pubescence short and dilute, but distinct on the 

 head, thorax, gaster and antehnse. 



Clay-yellow ; legs somewhat paler than the body, head more reddish, with 

 the mandibles, cheeks, border of the clypeus, vertex and. middle portion of the 

 antennal scapes to a variable extent dark brown or blackish. In some speci- 

 mens the whole head, except the occipital border, is dark brown. Each gastric 

 segment with a more or less distinct transverse brown band, broadened in the 

 middorsal line. 



Workei' minor. Length, 6-7 mm. 



Head, excluding the mandibles, moi'e than twice as long as broad, dis- 

 tinctly narrowed behind, with long, straight, parallel cheeks. Lobe of clypeus 

 without median sinuosity and with short, sharp, lateral corners. Thorax very 

 low and slender, base of epinotum more than three times as long as the 

 declivity. Petiole in profile conical, with blunt border. Legs and antennae 

 long and slender. 



Head, thorax and gaster moderately shining, very finely shagreened ; foveolfe 

 of the head represented only by a few, faint, elongate impressions on the 

 cheeks. 



Hairs pale yellow, less abundant than in the worker major. Erect hairs on 

 the antennal scapes shorter and more delicate, lacking on the legs. Pubescence 

 extremely short and dilute, visible only on the gaster and scapes. 



Pale clay-yellow throughout ; mandibular teeth and edge of clypeus and 

 cheeks brown or black. 



Female. Length, 11-14 mm. 



Resembling the worker major in sculpture, pilosity and color, but with the 

 head narrower behind and with straighter, more parallel sides. Insertions of 

 wings and anterior edge of scutellum black. Mesonotum immaculate, at most 

 with brownish streaks representing the underlying musculature seen through 

 the thin, yellow integument. Wings tinged with yellow ; veins and stigma 

 pale brown. 



Male. Length, 6-7 mm. 



Head somewhat longer than broad, with rather large eyes and ocelli, 



