wheeler: ants of the genus formica. 441 



type and, according to my observations, are confined to pine woods 

 and to higher altitudes. The queens were taken in the nests during 

 the latter half of July. 



36. F. TRUNCicoLA iNTEGROiDES var. HAEMORRHOiDALis Emery. 



F. rufa subsp. Integra var. haemorrhoidalis Emery, Zool. jahrb. Syst., 1893, 7, 

 p. 652, ^ ; Wheeler, Ants, 1910, p. 570. 



Worker. Length 4-9 mm. 



In structure, sculpture, and color like the preceding variety and the 

 typical integroides, but differing from both in having no erect hairs 

 on the head, thorax, petiole, and legs, with the exception of a few on 

 the clypeus and the row of bristles on the flexor surfaces of the tibiae. 

 Suberect haii's on the gaster sparse. The pubescence is the same as 

 in the two preceding forms and the gaster has the same appearance 

 of being covered with a bluish bloom. E.yes hairless. Mandibles 

 and frontal area rather shining. The small workers do not difl'er 

 in color from the large ones. 



Female. Length 9-10 mm. 



Similar to the female of coloradensis but lacking the erect hairs 

 on the head, thorax, petiole, and legs and the dark spots on the thorax. 

 Wings grayish hyaline, infuscated towards the base, with brown veins 

 and stigma. 



Male. Length 8 mm. 



Mandibles rather broad, edentate. Petiole thick, but with a com- 

 pressed, thin margin, broadly excised in the middle. 



Head and thorax opaque; gaster glossy; frontal area slightly shin- 

 ing. Body and legs covered with grayish pubescence which is longest 

 on the thorax and gaster. The erect hairs are very short, but moder- 

 ately abundant on the head, thorax, and gaster. Tibiae with short, 

 scattered, suberect hairs. 



Head, thorax, gaster, and antennae black; tips of mandibles, geni- 

 talia and legs testaceous or yellowish, femora and tarsi more or less 

 infuscated. Wings as in the female. 



Type locality. — Colorado. 



Colorado: Florissant 8,100 ft., Woodland Park 8,500 ft., Ute Pass, 

 Manitou, Garden of the Gods (Wheeler). 

 Dakota (Emery). 



Idaho: Moscow Mts. (J. M. Aldrich). 

 Nevada: Ormsl)y County (C. F. Baker). 



Washington: Yakima River opposite Ellensburg (S. Henshaw). 

 This variety lives in the same localities and builds nests very similar 



