WHEELER: ANTS OF THE GENUS FORMICA. 419 
which agree with these. From the fact that Pergande found the 
species living with F. pallidefulva, Emery has inferred that it is dulotic 
like sanguinea. 
F. pergandei is readily distinguished from sanguinea by its narrow 
head and body, its brown color and smoother surface. From F. 
munda it differs in having the erect hairs slender and pointed, in its 
duller coloration, narrower head and shorter maxillary palpi. 
16. F. EMERYI, sp. nov. 
F. pergandet Wheeler, Bull. Amer. mus. nat. hist., 1905, 21, p. 268. 
WorKER. Length 4.5-6 mm. 
Head a little longer than broad, a little narrower in front than 
behind, with straight cheeks and posterior border. Mandibles 
8-toothed. Maxillary palpi short. Clypeus sharply carinate, its 
anterior margin neither produced nor impressed but feebly and nar- 
rowly notched in the middle. Antennae rather robust; scapes slightly 
enlarged towards their tips; funicular joints subequal; joints 2-5 
a little more slender than the succeeding joints. Thorax rather long, 
pro- and mesonotum depressed, mesoépinotal constriction narrow, 
the posterior surface of the mesonotum falling suddenly to the level 
of the metanotum; epinotum angular, with subequal base and de- 
clivity, the former with a very faint transverse impression jn the 
middle. Petiole narrow; cuneate in profile, with straight posterior 
and very feebly convex anterior surface, its border entire, rounded and 
rather sharp. Gaster elliptical, more elongate than in any of the pre- 
ceding species. Legs stout and rather long. 
Mandibles shining, very finely and rather superficially striated, 
with very fine, scattered punctures. Remainder of body opaque, 
its surface very finely and uniformly shagreened; gaster with a slightly 
metallic luster. 
Pilosity and pubescence gray, the former represented by only a few 
erect hairs on the front and clypeus and two transverse rows of sparse 
hairs on each gastric segment, which are somewhat longer towards 
the tip and on the venter. Tibiae each with a row of bristles on their 
flexor surfaces. Pubescence extremely short and inconspicuous on 
the head, thorax, petiole, and legs, a little longer and much denser 
on the gaster, so that this region has a grayish tint. 
Brown; gaster black; mandibles red; dorsal portion of head infus- 
cated or blackened. 
FEMALE. Length 7-7.5 mm. 
Closely resembling the worker in sculpture, pilosity, and color. 
Mandibles much more coarsely striatopunctate. Clypeus with 
