1915.] Wheeler, Additions to the Ant-Fauna of North America. 401 
Testaceous yellow; legs a little paler; mandibles and clypeus deep red, with 
black borders; petiole and postpetiole brownish, gaster also faintly tinged with 
brown. 
Worker. Length: 1.5 mm. 
Head as broad as long, subrectangular, with feebly convex sides and feebly 
excised posterior border; anterior clypeal margin entire, broadly rounded. Antennal 
scapes reaching a little beyond the posterior corners. Pro- and mesonotum together 
convex and evenly rounded above, the latter without a torus. Base of epinotum 
feebly convex, longer than the declivity; spines reduced to small, slender, erect 
teeth. Petiole from above twice as long as broad, with concave sides; node rounded, 
entire; postpetiole about 4 again as broad as the petiole, convex and rounded above, 
transversely elliptical, distinctly broader than long. Gaster about the size of the 
head. 3 
Smooth and shining; mandibles finely striato-punctate; cheeks longitudinally 
rugulose. Mesopleure, epinotum and petiole slightly opaque, densely punctate. 
Pilosity similar to that of the soldier, but hairs on the body more obtuse. Color 
like that of the soldier but the head and thorax more brownish; mandibles and 
clypeus not darker than the anterior portion of the head; legs and antenne yellowish. 
Described from six soldiers and nineteen workers taken on the banks of 
the Santa Cruz River at Tucson, Arizona. The nests were incomplete 
craters in sandy soil exposed to the sun, with small entrance and the exca- 
vated sand dumped to one side. Only one or two soldiers were found in a 
nest. The species is apparently carnivorous. 
This ant at first sight seems to be very closely related to the South 
American Ph. stulta, but the soldier is at once distinguished by the absence 
of a carina on the clypeus and considerable differences in the shape of the 
petiole and postpetiole. The worker is much smaller than that of stulta, 
with much shorter antennal scapes, longer epinotal spines, shorter thorax, 
etc. 
18. Pheidole virago sp. nov. 
Soldier. Length 4-4.5 mm. 
Head very large, about 4 longer than broad, distinctly broader behind than in 
front, with straight sides, and prominent, rounded posterior lobes, separated by a 
very deep occipital excision continued forward nearly to the frontal area as a deep 
groove. In profile the head is convex above and below and very slightly compressed 
in the region of the posterior lobes. Eyes rather small and flat, near the anterior 
fourth of the head. Mandibles very convex, with two blunt apical teeth. Clypeus 
very short, its anterior border feebly and sinuately excised in the middle, median 
surface feebly convex, with indistinct carina. Frontal area distinct, broadly tri- 
angular. Frontal carinz short, diverging. Antenne small and slender; scapes 
curved, but not flattened at the base, not reaching to the eyes; funicular joints 2-8 
subequal, a little longer than broad; club shorter than the remainder of the funiculus, 
the two basal joints subequal, together a little longer than the terminal joint. Thorax 
