524 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Hairs less abundant than in the typical cinerea, absent on the sides 
of the head and thorax; only a few long erect hairs on the gula. Legs 
without erect or oblique hairs on their flexor surfaces. Pubescence 
dense, but shorter and less silvery than in the typical cinerea. 
Color of body as in the darker forms of the European type; man- 
dibles, cheeks, anterior border of clypeus, antennae, except the tips of 
_ the funiculi, petiole, and legs dark red or brownish. 
FEMALE. Length 7 mm. 
Closely resembling the worker in sculpture, pilosity, and color. 
Hairs shorter and less abundant than in the female cinerea and as 
in the worker absent on the sides of the head and thorax. Wings 
colorless and more transparent than in the typical form, with pale 
brown veins and darker stigma. 
Mate. Length 7-8 mm. 
Differing from the male of the typical cinerea in the same characters 
as the worker and female, the body being smoother, less pilose and 
more delicately pubescent. There are very few erect hairs on the gula 
and there are none on thelegs. Gaster dark brown; genitalia distinctly 
infuscated. Antennae black, like the head, thorax, and petiole; 
legs clear yellow. Mandibles very narrow, edentate, with long points, 
black, with brownish tips. Wings as in the female. 
Described from many workers, two males, and a single rather im- 
mature female from Florissant, Colorado (8,100 ft.). I have also found 
this variety on Cheyenne Mountain, near Colorado Springs at about the 
sameelevation, At first sight it would seem to be a hybrid between F. 
fusca var. argentea and the next variety, neocinerea, but the latter does 
not occur at Florissant, being peculiar to lower altitudes, and the 
var. altipetens is extremely common in the type locality, where it 
forms populous colonies which inhabit large earthen mound-nests 
(2-3 ft. in diameter and 6-10 inches high), overgrown with grass in 
the alpine meadows. It also nests under stones in the same stations. 
It is enslaved by Polyergus breviceps and the alpine forms of F. san- 
guinea. 
108. F. CINEREA CINEREA Var. NEOCINEREA Wheeler. 
F. cinerea Wheeler, Amer. nat., 1902, 36, p. 947. 
F’. cinerea var. neocinerea Wheeler, Ants, 1910, p. 571. 
Worker. Length 3-6 mm. 
Shape of thorax varying from that of the var. altipetens to that of 
the typical cinerea. Petiole more as in the latter form, the border 
being sharper and broader, but usually entire and sometimes bluntly 
angular in the middle. 
