WHEELER: ANTS OF THE GENUS FORMICA. 475 
61. F. ADAMSI var. ALPINA Wheeler. 
F. adamsi var. alpina Wheeler, Journ. N. Y. ent. soc., 1909, 17, p. 84, 8; 
Rept. Mich. geol. survey for 1908, 1909, p. 327, 8. 
Worker. Length 3.5-5 mm. 
Differing from the typical adams? in having the border of the petiole 
more attenuated and more produced upward in the middle, in the 
black markings on the head, pro- and mesonotum being more restricted 
and in having the frontal area smoother and more shining. 
Type LocaLity.— Colorado: Pikes Peak, 10,500-11,000 ft., 
(Wheeler). 
Idaho: Troy (W. M. Mann). 
Nova Scotia: Boisdale, Cape Breton I. (Amer. Mus. Nat. Hist. 
Coll.). 
The red portions of the specimens from Idaho are paler than in 
those from Colorado and Cape Breton I. and the yellow spot at the 
base of the gaster is conspicuous. The true status of this variety, 
however, can be determined only by the study of more material than 
I have been able to secure. 
62. F. nepricuLta Wheeler. 
F. nepticula Wheeler, Bull. Amer. mus. nat. hist., 1905, 21, p.270, 8 9 3; 
Ibid., 1906, 22, p. 64. 
Worker. Length 3.5-6 mm. 
Mandibles 8-toothed. Head, excluding the mandibles, a little 
longer than broad, but little narrower in front than behind, with 
straight sides and posterior border. Clypeus strongly carinate, its 
anterior border angularly produced in the middle. Frontal area 
triangular, as long as broad. Antennae rather stout, first to fourth 
funicular joints longer and more slender than the penultimate joints. 
Thorax in profile with very convex pro- and mesonotum and very 
deep mesoépinotal constriction, which is broad at the bottom. Epino- 
tum rounded, without distinct base and declivity, or, at any rate, 
without an angle between the base and declivity. Petiole large, as 
high as the epinotum, convex in front, more flattened behind, border 
rather sharp; seen from behind it is transverse in the middle and 
obliquely truncated on each side, the lateral borders being straight 
and converging below. 
Head, thorax, and petiole subopaque, very finely shagreened; 
mandibles, clypeus, and frontal portion of head, and especially the 
