1907.] 
Wheeler, A New Guest-ant. 
75 
New Mexico: Las \^egas, 6,398 feet, and Pecos, 6,366 feet 
(T. D. A. Cockerell). 
The specimens from Pecos (two workers) have unusually 
short spines, which are hardly longer than broad at their bases. 
3, Var. decedens var. nov. 
Worker. Length 3.5 — 4 mm. Scapes evenly curved at the base 
as in the typical form. Spines short, straight and acute, somewhat 
more than half as long as the base of the epinotum. Sculpture of head 
as in the typical form, but the thorax above vermiculately and reticu- 
lately, instead of longitudinally rugose ; sides of pronotum densely 
punctate, meso- and metapleurse longitudinally rugose. Sculpture of 
petiole and postpetiole as in the typical form. Body and appendages 
yellov^ish brown ; head dark brown or blackish above ; gaster black. 
Male. Length 4.5 mm. Scapes straight, nearly 1/3 as long as the 
funiculi. Wings uniformly whitish hj^aline, not suffused with yellow 
at the base ; veins and stigma very pale brown. 
Colorado : Buena Vista, 7,900 feet, and Florissant, 8,500 feet 
(Wheeler). 
Colonies rather small, nesting under stones in grassy places 
on the banks of streams. 
4. Var. sulcinodoides Emery. 
Emery included more than one variety under this name, as 
shown by the localities which he cites (South Dakota, Utah, 
Maine). I would restrict the name to a distinct, large and dark- 
colored form, which is very common in the Rocky Mountains, at 
an altitude of 8,000 to 10,000 feet under stones and logs along 
the margins of subalpine streams and meadows. The larvae and 
immature pupae of this form have a pecular greenish yellow color 
and oily luster, which I have not observed in any of the other 
varieties. Emery's statement that sulcinodoides approaches the 
Bvuropean sulcinodis, is true of the worker but not of the male, 
which has extremely short antennal scapes. 
Worker. Length 4.5 — 5.3 mm. Antennal scapes with a distinctly 
ang^Lilar bend at the base, which is narrow and somewhat compressed. 
Spines as long as the base of the epinotum, slender, straight, acute 
and diverging. Sculpture strong; rugae on the sides of the head 
