470 bulletin: museum of comparative zoology. 



obliquely flattened above so that the posterior surface is higher than 

 the anterior. Seen from behind the upper border is entire and broadly 

 rounded. In rasilis and the typical microgyna the border is sharper 

 and more compressed. Frontal area very smooth and shining. Color, 

 sculpture, and pilosity as in these forms. Upper surface of head and 

 thorax, and the gula with rather numerous erect hairs; tibiae with 

 numerous oblique hairs. Wings as in the female. 



Described from numerous workers, males, and rather immature 

 females taken from five colonies at Florissant, Colorado (altitude 

 8,100 ft.). 



57. F. MICROGYNA SCITULA, subsp. UOV. 



Female. Length 4.5 mm. 



Closely resembling the female of rasilis in color, except that the base 

 of the first gastric segment is brownish red like the head; thorax, 

 petiole, legs, scapes and base of the funiculi, and the wings are faintly 

 but distinctly infuscated. Anal region reddish. Gaster and terminal 

 funicular joints dark brown. The clavate hairs on the head, thorax, 

 and gaster are as long as in the var. spicata but more numerous on the 

 posterior portion of the pronotum and the whole of the mesonotum. 

 Gula with a very few erect hairs. Pubescence very fine and indistinct, 

 except on the gaster. There are no oblique or suberect hairs on the 

 scapes or legs. The body, including the legs and gaster, is smooth 

 and slightly shining, the frontal area subopaque. 



Described from a single specimen taken during June 1909 by 

 Mr. W. T. Davis at Clayton, Georgia, 2,000-3,700 ft. 



This specimen is so much like the female microgyna, and especially 

 those of its subspecies rasilis and the var. spicata that I feel compelled 

 to place it here, although the locality is far distant from the range of 

 the allied forms. Its ultimate taxonomic position will, of course, 

 depend on the discovery of the worker and male. 



58. F. nevadensis Wheeler. 



F. microgyna var. nevadensis Wlieeler, Bull. Amer. miis. nat. hist., 1904, 20, 



p. 373, 9. 

 F. nevadensis Wheeler, Bull. Amer. mus. nat. hist., 1905, 21, p. 272; Ants, 



1910, p. 570. 



Female. Length 4.5 mm. 



Closely resembling the female of the typical F. microgyna but differ- 

 ing in the following characters : — The petiole in profile is cuneate. 



