WHEELER: ANTS OF THE GENUS FORMICA. 457 
46. F. cRINIVENTRIS Wheeler. 
F. crinita Wheeler, Journ. N. Y. ent. soc., 1909, 17, p. 87, 8 @. 
F. criniventris, nom. nov. Wheeler, Psyche, 1912, 19, p. 90. 
Worker. Length 4-6.5 mm. 
Resembling the worker of the preceding species but averaging some- 
what smaller. Head, excluding the mandibles, a little longer than 
broad, even in the largest workers; narrower in front than behind 
with nearly straight posterior and lateral margins. Eyes rather large. 
Mandibles 7-8 toothed. Clypeus carinate, with entire anterior border, 
slightly projecting in the middle. Frontal furrow distinct. Antennae, 
thorax, and petiole as in comata. Palpirather short. Gaster and legs 
of the usual shape. 
Body subopaque, very finely shagreened; bases of mandibles, 
frontal area, and corners of clypeus glabrous. Mandibles and clypeus 
finely, longitudinally striated. 
Hairs yellow; absent on the head, thorax, petiole, and appendages, 
blunt and scattered on the gaster, pointed on the clypeus, mandibles, 
and venter. Pubeseence yellowish and very short, inconspicuous 
on the head, thorax, and petiole, somewhat longer on the legs and 
gaster; on the latter rather dense and nearly concealing the surface. 
Eyes hairless. 
Yellowish red; gaster dark reddish brown, except the anal region 
and a spot at the base of the first segment, which are yellowish; tips 
of antennal funiculi, middle portions of femora and tibiae brownish 
orreddish. Thesmallest workers have the upper surface of the thorax, 
especially the pro- and mesonotum, somewhat infuscated. Mandibu- 
lar teeth black. 
FremMaLe. Length 6.5-7 mm. 
Resembling the female of ciliata. Body shining throughout, very 
finely shagreened, without pubescence. Hairs very long, yellow, 
curled or hooked at their tips, confined to the clypeus, gaster, and ven- 
tral surface of the petiole; on the gaster appressed and arranged in 
two rows near the posterior border of each segment. Body and appen- 
dages yellow; teeth of mandibles and anterior edge of clypeus black; 
scutellum, metanotum, and anteromedian and two parapsidal blotches 
on the mesonotum, anterior borders of cheeks, and a narrow band 
parallel with the posterior edge of each gastric segment, brown. An- 
tennal funiculi infuscated towards their tips. Wings grayish hyaline, 
with pale brown veins and darker brown stigma. 
Host. Unknown, probably F. fusca var. argentea or neoclara. 
TYPE LocALITy.— Colorado: Boulder, (Wheeler). 
Montana: Helena (Hubbard and Schwarz). 
