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 ; email 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 worlyer 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 meaonotum 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 thi-ee 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 natui^ally with sanguinea. In 

 the shape of the body it shows an even closer relationship to F. per- 

 gandei, munda, and emeryi. The small size of the female seems to 

 indicate that it is a parasitic species. INIr. Mann informs me that the 

 colonies are small and nest under stones in dry, hot, and often sandy, 

 desert country. 



18. F. PERPiLOSA Wheeler. 



F. fusca subpoUta var. perpilosa Wheeler, Mem. revist. Soc. cient. Ant. Alzate, 

 1902, 17, p. 141; Herrera, Boll. Comision parasit. agric, 1902, 1, p. 404. 



Worker. Length 3-5.5 mm. 



Head in large workers, excluding the mandibles, about as broad as 

 long, a little naiTower in front than behind, with straight lateral and 

 posterior borders. Clj'peus 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- 



