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Nae 
WHEELER: ANTS OF THE GENUS FORMICA. Dar 
behind, with straight posterior border and feebly convex sides; the 
small workers having the head much smaller, slightly longer than 
broad, with straight sides, and posterior borders and more rounded 
posterior corners. Eyes small; in the largest workers flat, in small 
workers more convex. Mandibles convex. Clypeus very strongly 
carinate, its anterior border subangularly produced in the middle. 
Frontal carinae diverging behind. Antennae stout; scapes rather 
strongly curved at the base, distinctly incrassated at their tips; 
funicular joints 2-4 narrower but scarcely longer than the penultimate 
joints; first funicular joint nearly as long as the second and third 
together, the second shorter than the third. Maxillary palpi rather 
short. Thorax short and robust; the pro- and especially the mesono- 
tum very convex in the largest workers, the mesoépinotal constriction 
short and deep, the epinotum with the base broadly convex in profile 
and distinctly shorter than the sloping declivity into which it passes 
through a rounded angle. In medium sized and small workers, the 
pro- and mesonotum are only moderately convex and the mesoépino- 
tal constriction is shallow. Petiole rather high and broad, compressed 
anteroposteriorly, with convex anterior and flat posterior surface; 
the border sharp and when seen from behind broadly rounded and 
entire. Gaster rather large; legs stout. 
Surface of body shining, especially the gaster and posterior half of 
the head, finely shagreened. In the largest workers the mandibles, 
clypeus, front, cheeks, thorax, and petiole are opaque or subopaque and 
more coarsely sculptured; the mandibles and clypeus being sharply, 
densely, and longitudinally striate, the mandibles striatopunctate, the 
remaining opaque surfaces sharply shagreened. In medium and small 
workers the anterior portion of the head, including the mandibles, 
clypeus, and thorax, is distinctly shining and much more delicately 
shagreened. Frontal area in some specimens opaque, in others smooth 
and shining, apparently irrespective of the size of the specimen. 
Hairs golden yellow, coarse, pointed, erect and very sparse, present 
on the clypeus, upper surface of the head, gula, pronotum, and gaster. 
Pubescence short and very sparse, with difficulty perceptible under an 
ordinary magnification even on the gaster; very fine and dense on the 
scapes. 
Body varying from brownish red to dark chestnut-brown; legs 
paler and more yellowish; gaster and posterodorsal portion of the 
head black. Tips of antennal funiculi and sometimes also in large 
workers the middorsal portion of the pro- and mesonotum infuscated. 
FEMALE. Length 8-10 mm. 
Resembling the worker, but the whole head opaque, finely and 
densely punctate behind, with coarsely striatopunctate mandibles 
and sharply striated clypeus. Frontal area opaque and finely punc- 
tate. Thorax subopaque, finely and densely punctate, except the 
