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. nov. 
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 raszlis 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 Wheeler, Bull. Amer. mus. nat. hist., 1904, 20, 
Pusat? 
F. nevadensis Wheeler, Bull. Amer. mus. nat. hist., 1905, 21, p. 272; Ants, 
1910, p. 570. 
FeMALeE. 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, 
