1907.] 
Wheeler, A New Guest-ant. 
73 
has described a second variety, frigida, from British Columbia. 
The North American hrevinodis, Hke the European sulcinodis, is 
restricted to the mountains, though in the Northern States one of 
its varieties occasionally, and in British America probably more 
generally, descends to much lower elevations. The worker and 
female of M. hrevinodis differ from sulcinodis in the shape of the 
antennal scape, which even in the variety siilcinodoides is more 
uniformly and gracefully bent at the base. The males of all the 
forms of hrevinodis I have seen, have the scape unusually short, 
never more than a third and often only a fifth or sixth as long 
as the funiculus, whereas the scape of the male sulcinodis is nearly 
half as long as the remainder of the antenna. The body of the 
male hrevinodis is, moreover, always deep black, whereas it is 
more "or less red or brown in the European subspecies. Although 
even in single colonies the size, sculpture and color of the individ- 
uals may vary considerably, I am able to distinguish the following 
varieties among the specimens in my collection : 
I. Myrmica rubra hrevinodis Emery, (typical). 
This form was based on some workers from Salt Lake, Utah. 
Emery's description agrees very closely with a form which is not 
uncommon in Colorado, at altitudes below 7,000 feet, nesting in 
the sandy and gravelly banks of streams. The male described by 
Emery cannot belong to this, or indeed to any other form of 
hrevinodis, on account of the great length of the antennal scape, 
which is recorded as "not quite as long as half of the funiculus." 
The following description is drawn from specimens belonging to 
a single colony : 
Worker. Lengi:h 4 — 4.5 mm. Antennal scape evenly bent at the 
base, not angnilar and not compressed, gradually enlarged distally. 
Epinotum with well-developed, rather slender and curved spines, which 
are nearly as long as the base of the segment. Petiole short, less than 
twice as long as broad, in profile with gradual, concave, anterior slope, 
rather acute summit and ang'ularly convex posterior slope. Sculpture 
of body moderately strong; rugae on upper surface of head sharply 
longitudinal and reticulate, on the occiput and sides of head reticulate 
