1914] Wheeler—American Species of Myrmica 12] 
M. mutica. Clypeus convex, its anterior border very feebly sinuate in the middle. 
Frontal area indistinct. Thorax similar to that of mutica, but the epinotum with 
its base feebly and evenly convex and fully twice as long as the distinctly concave 
declivity. Petiole laterally compressed ventrally, with a small, acute tooth near 
the anterior end of the peduncle, its node from above subelliptical, longer than 
broad, in profile with concave anterior and slightly convex posterior slopes. Post- 
petiole from above but little broader than the petiole, slightly longer than broad, 
a little broader behind than in front; in profile convex above, especially behind, 
below with a prominent conical or pointed protuberance near its anterior end. 
Mandibles opaque, finely longitudinally striated, their dental border smooth and 
shining. Head and thorax opaque, longitudinally rugulose-punctate, posterior 
portion of clypeus, vertex, occiput and pronotum above smooth and shining. Epi- 
notum transversely rugulose. Gaster, legs, petiolar and postpetiolar nodes smooth 
and shining, with sparse, minute, piligerous punctures; petiole and postpetiole on 
the sides and below subopaque; finely and densely punctate. 
Hairs white, erect, rather short; covering the body, legs and scapes as in M. mutica. 
Brownish yellow; dental borders of mandibles and antennal clubs pale brown. 
Described from sixteen specimens taken by Prof. J. M. Aldrich 
at Moscow, Idaho. 
At first sight this species may be readily mistaken for an im- 
mature M. mutica on account of its yellow color, but on closer 
inspection it is easily distinguished by the shape of the epinotum 
and postpetiole and the smooth front, occiput, pronotum and 
petiolar mode. 
Myrmica (Oreomyrma) hunteri sp. nov. (Fig. 1 c). 
Worker: Length 4-6 mm. 
Closely related to M. aldrichi but differing in the following characters: Body 
and appendages brownish red or ferruginous, with a large, black, subtriangular spot 
on the vertex and a band of the same color across the posterior portion of the first 
gastric segment. Frontal area, posterior clypeal suture, antennal clubs and dental 
border of mandibles more or less infusecated. Sculpture sharper and coarser than 
in aldricht. Upper surface of head with coarse, scattered punctures in addition to 
the rugee. Smooth areas on the head, thorax and pedicel much as in that species. 
Hairs pale yellow instead of white. Anterior clypeal border entire. Base of 
epinotum somewhat flattened, anteroventral protuberance of postpetiole broadly 
rounded and not conical or pointed. 
Described from a dozen specimens taken by Dr. S. J. Hunter 
from a couple of nests on the slopes of two mountains on the Madi- 
son River, nearly opposite the mouth of Beaver Creek, Montana, 
at an altitude of about 7,500 feet. The nests were in shaley earth 
and apparently of the crater type. 
Of all the American species of Oreomryma, hunteri is most closely 
related to the palearctic rubida in coloration and sculpture. Per- 
