WHEELER: ANTS OF THE GENUS FORMICA. 421 
Hairs whitish, long, rather slender, erect, sparse; conspicuous on 
the upper surface of the head, clypeus, gula, thoracic dorsum, petiolar 
border, gaster, and fore coxae. Pubescence very short and sparse, 
most clearly visible on the gaster and legs but far from concealing the 
ground surface; scarcely perceptible on the cheeks and pleurae. 
Rich red, legs a little paler and more yellowish; small workers darker 
and more brownish; tips of antennal funiculi and sometimes also the 
posterodorsal portion of the head in the large workers slightly infus- 
cated; gaster always deep black throughout. 
FEMALE (DEALATED). Length 6-7 mm. 
Closely resembling the worker in sculpture, pilosity, and color. 
The notch in the clypeus is very broad and shallow and the carina 
very blunt or lacking. The petiole is broad, with a flat, very sharp 
border. The mesonotum bears three faint brownish blotches, the 
wing-insertions and sutures of the thorax are blackish and the base 
of the first gastric segment is red, the posterior borders of the seg- 
ments yellowish. 
TYPE LocaLity.— Washington: Kiona, (W. M. Mann). 
Washington: Wapata, Wenatchee, Ellensburg (W. M. Mann). 
California: Owen’s Lake (H. F. Wickham). 
The series of specimens includes many workers and three females, 
two from Kiona and one from Owen’s Lake. At first sight this species, 
on account of its smooth and shining body and the character of the 
pubescence, appears to belong in the fusca group, but the structure of 
the clypeus seems to associate it more naturally with sanguinea. In 
the shape of the body it shows an even closer relationship to F. per- 
gander, munda, and emeryi. The small size of the female seems to 
indicate that it is a parasitic species. Mr. Mann informs me that the 
colonies are small and nest under stones in dry, hot, and often sandy, 
desert country. 
18. F. perprtosa Wheeler. 
F. fusca subpolita var. perpilosa Wheeler, Mem. revist. Soc. cient. Ant. Alzate, 
1902, 17, p. 141; Herrera, Boll. Comision parasit. agric., 1902, 1, p. 404. 
WorKeER. Length 3-5.5 mm. 
Head in large workers, excluding the mandibles, about as broad as 
long, a little narrower in front than behind, with straight lateral and 
posterior borders. Clypeus carinate, its anterior border rounded, 
entire, or in some specimens slightly truncated or even feebly emargi- 
nate in the middle. Antennae rather stout; scapes somewhat thick- 
ened towards their tips; basal joints of funiculus narrower but not 
longer than the penultimate joints. Frontal carinae diverging be- 
