WHEELER: ANTS OF THE GENUS FORMICA. 459 
Bright yellowish red, mandibles and antennal scapes darker; funi- 
euli and legs reddish brown, their articulations more yellowish. Gaster 
black, anal segment, a large spot at the base of the first segment and 
often a spot on each of the sternites, yellow or red. Some of the small- 
est workers have the vertex, pro- and mesonotum blotched with black, 
but others have the head and thorax almost as immaculate as large 
individuals. 
FreMaLe. Length 7.5-9 mm. 
Head resembling that of the worker but with less convex sides. 
Carina of clypeus delicate. Thorax nearly as broad as the head, 
robust. Petiole very broad, much compressed anteroposteriorly, 
feebly convex in front, flattened behind, the sharp border broadly 
rounded, more rarely bluntly angular in the middle. 
Mandibles striatopunctate, somewhat less shining than the re- 
mainder of the body, which, together with the appendages, is smooth; 
the upper surface of the head, mesonotum, and scutellum, especially 
are highly glabrous. 
Entire body, including the antennal scapes and legs, covered with 
short, delicate, erect or suberect, silvery white hairs which nowhere 
conceal the shining surface. These hairs are abundant and conspicu- 
ous on the scapes, legs, and gaster, less abundant on the front of the 
head, and on the mesonotum, at least in some specimens. [Eyes 
hairy. 
Color rich yellowish red; mandibular teeth, anterolateral borders 
of clypeus, thoracic sutures, alar insertions, metanotum, and adja- 
cent border of scutellum, posterior border of each gastric segment, 
palpi, articulations of legs, and terminal half of funiculi, black or 
infuscated. Wings uniformly gray, veins and stigma sordid yellow. 
Mae. Length 7-8 mm. 
Mandibles 3-4-toothed. Maxillary palpi slender, 5-jointed. Head 
small, eyes large, cheeks rather concave, postocular region less promi- 
nent than in the male ciliata. Clypeus sharply carinate. Thorax 
robust, decidedly broader than the head. Petiole low, cuneate in 
profile, thick at base, but becoming rapidly thin towards the superior 
border, which when seen from behind is feebly and broadly excised 
in the middle. 
Body opaque, finely shagreened; frontal area shining; mesonotum, 
scutellum, and gaster above slightly lustrous. 
Hairs gray, dense, longest and suberect on the head, thorax, and 
petiole, more reclinate on the gaster, very short and subappressed on 
the legs and antennae. Eyes distinctly hairy. Gaster delicately 
gray pubescent. 
Deep black; genitalia, tips of trochanters, knees, basal portions 
of first and second tarsal joints, reddish yellow. Wings like those of the 
female, except that the stigma is darker. 
