WHEELER: ANTS OF THE GENUS FORMICA. 495 
with entire, rounded, projecting anterior border. Frontal carinae 
moderately diverging behind. Antennae rather slender, the scapes 
slightly thickened towards their tips, the basal joints of the funiculus 
scarcely longer and but little more slender than the penultimate joints. 
Maxillary palpi moderately long. Thorax narrow; pro- and mesono- 
tum but slightly convex, rather depressed above; mesoépinotal con- 
striction shallow; epinotum with subequal base and declivity, both 
straight in profile, the former horizontal, the latter sloping, meeting 
at a distinct but obtuse angle. Petiole narrow, cuneate in profile, 
with convex anterior and flattened posterior surface, its border rather 
sharp, entire and broadly rounded when seen from behind. Gaster 
small, legs rather slender. 
Subopaque and very finely and sharply shagreened; mandibles 
coarsely striatopunctate; clypeus finely longitudinally striate. Fron- 
tal area subopaque, only the sutures surrounding it shining. 
Hairs and pubescence whitish, the former short, erect, very sparse, 
confined to the upper surface of the head, thorax and gaster, coxae 
and venter. Eyes hairless. Pubescence dense on the head, thorax, 
and gaster, longest on the gaster, giving the surface a slightly pruinose, 
but not a silky appearance. 
Black; mandibles, scapes, basal joints of funiculi, and legs deep red, 
femora and tibiae, except the knees, often darker. 
FEMALE. Length 7-10 mm. 
Smaller than the females of rufa, but the gaster proportionally 
larger and more elliptical. Thorax broader than the head, which, 
excluding the mandibles, is as broad as long. Petiole compressed 
anteroposteriorly and broader than in the worker. Wings long. 
Sculpture, pilosity, and color much as in the worker, except that the 
gaster is very smooth and shining, with much more dilute pubescence. 
Wings nearly colorless or very slightly yellowish; stigma brown. 
Mate. Length 8-10 mm. 
Body slender. Mandibles narrow, pointed, often, if not always, 
denticulate. Head broad behind and considerably narrowed in front, 
with large eyes, straight posterior border and cheeks and rounded pos- 
terior corners. Clypeus convex, bluntly carinate. Thorax broader 
than the head. Petiole transverse, somewhat compressed anteropos- 
teriorly towards the superior border, which is blunt and, seen from 
behind, with a broad and very shallow median excision. Gaster 
rather long and narrow. Stipes but little longer than the volsellae 
and sagittae. 
Head and thorax, including the mandibles and frontal area, sub- 
opaque. Gaster distinctly shining. 
Hairs and pubescence much as in the worker, the former absent 
on, the upper surface of the gaster. Eyes hairless. 
Black; gaster often more brownish; scapes and tips of mandibles 
