458 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
South Dakota: Harding County (S. S. Visher). 
The worker differs from those of ciliata, comata, and oreas in the ab- 
sence of hairs on the head, thorax, and petiole, and the female has 
much fewer hairs and these are confined to the clypeus and gaster. 
The hairs are very easily rubbed off in both workers and females, 
but the long series of the former and the callows of the latter show that 
they cannot be more abundant than described above. The colony 
from which the type specimens were taken was very populous. Its 
nest resembled very closely those of ciliata, comata, and oreas which 
I have examined in Colorado. It was under several contiguous stones, 
banked with vegetable detritus and in the immediate neighborhood 
of flourishing colonies of F. ciliata and rufa aggerans. 
47. F. oreEas Wheeler. 
F. oreas Wheeler, Bull. Amer. mus. nat. hist., 1903, 19, p. 648, 8 9 o. 
WorkKErR. Length 4.5-7 mm. 
Resembling the workers of F. ciliata, comata, and criniventris. 
Mandibles 8-toothed. Head, excluding the mandibles, as broad as 
long, slightly narrower in front than behind, with feebly concave 
posterior border, rather broadly rounded posterior corners, and convex 
sides. Clypeus carinate its entire length, with broadly rounded, not 
produced anterior border. Antennae rather slender, funicular joints 
1-3 longer and more slender than the penultimate joints. Frontal 
carinae rather strongly diverging. Palpi short. Thorax with convex 
pro- and mesonotum and deep mesoépinotal constriction. Epinotum 
with the base horizontal and slightly convex, distinctly longer than the 
rapidly sloping and distinctly concave declivity with which it forms 
an obtuse angle. Petiole broad, compressed anteroposteriorly with a 
sharp superior border, which is either bluntly pointed or slightly trun- 
cated in the middle. 
Body subopaque, very finely shagreened, anterior portion of head 
smooth and shining, mandibles and clypeus longitudinally striated, 
shining; frontal area glabrous. 
Hairs silvery white or pale yellow, short, abundant, erect, covering 
both the dorsal and gular surfaces of the head, the thorax, border of 
petiole, and gaster. Hairs on the ocellar region conspicuously long. 
Seapes and legs covered with shorter, suberect hairs. Hairs on the 
gaster pointed and more delicate than in the three preceding species, 
long on the venter and terminal segments. Eyes hairy. Pubescence 
yellowish, sparse on the head, somewhat more abundant on the thorax 
and sufficiently dense on the gaster to conceal the surface and give it a 
grayish tinge. 
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