448 bulletin: museum of comparative zoology. 



nest and these are often very imperfectly dealated. As early as 

 April 3 I have found many perfectly winged queens as well as several 

 with the wings more or less gnawed off, in various colonies near Boston. 

 These queens had evidently been retained by the maternal colony or 

 adopted after leaving other colonies on their nuptial flight. Tan- 

 quary and I have recently shown that the queens of this ant establish 

 new colonies through temporary parasitism on F. fusca var. subscricea. 



40. F. TRUNCicoLA oBSCURiVENTRis var. GYMNOMMA Wheeler. 

 F. dryas var. gymnomma Wheeler, Bull. Amer. mus. nat. hist., 1905, 21, p. 269, 



F. rufa subsp. obscuriventris var. gymnomma Wheeler, Ants, 1910, p. 570. 



Worker. Length 3.5-7.5 mm. 



Differing from the typical obscuriventris only in having the eyes 

 hairless and in having the erect hairs on the body less abundant, 

 especially on the upper surface of the head. 



Type locality. — New York: Cold Spring Harbor, Long Island, 

 (Wheeler). 



Massachusetts: Wellesley (Wheeler). 



Georgia: Clayton, 2,000-3,700 ft. (W. T. Davis). 



Illinois: Rockford (Wheeler). 



4L F. uralensis Ruzsky. 



F. uralensis Ruzsky, Arb. Ges. naturf. Kasan, 1895, 28, p. 13, S 9 cf; 

 Berlin, ent. zeitschr., 1896, 41, p. 69; Formicar. Imper. Ross., 1905. 

 p. 348, fig. 66; Emery, Deutschr. ent. zeitschr., 1909, p. 189. 



Worker. Length 5-8 mm. 



Head as broad as long, but little narrower in front than behind. 

 Frontal carinae strongly diverging. Clypeus strongly carinate, with 

 produced, angular, anterior margin. Antennae robust, the scapes 

 short and thick. Petiole rather broad, compressed anteroposteriorly, 

 with sharp, rounded, entire border. 



Opaque; mandibles subopaque, densely striatopunctate. Sides 

 of head glossy. Frontal area opaque. 



Pilosity of the whole body very sparse, tibiae without oblique or 

 suberect hairs. Gula with a few erect hairs. Pubescence yellowish, 

 fine and sparse on the gaster and legs, denser on the cheeks and thorax. 

 Eyes hairless. 



In color resembling the darkest forms of F. nifa pratensis, but the 



