564 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
of the bronzy effect. The sculpture is as coarse as in the worker or 
even coarser, especially on the gaster, but the surface of the body, 
and especially of the scutellum, epinotum, and gaster, is a little more 
shining. Wings distinctly infuscated, much as in F. fusca var. sub- 
sericea, with blackish veins and stigma. 
Mate. Length 9 mm. 
Differing from the male of the typical fusca in having the wings dis- 
tinctly infuscated, the bases of the femora and the tips of the external 
genital appendages more blackish, the surface of the body more 
coarsely punctate and more opaque and of a deeper black color. 
The erect hairs on the head and thorax are much more abundant and 
the pubescence on these parts and on the gaster is distinctly longer and 
coarser. The mandibles are bluntly dentate. 
Described from numerous workers and females and one male taken 
by Mr. W. M. Mann at Guerrero Mill (9,000 ft.), Velasco, below Real 
del Monte, El] Chico and Pachuca, in Hidalgo, Mexico. Mr. Mann 
found this ant to be more pugnaceous than fusca and its var. subsericea. 
It nests in large colonies under stones in exposed, open localities, such as 
hill-tops, but more commonly in shady places where the soil is moister. 
Were it not for the erect hairs on the gula of the worker and female, 
and the peculiar sculpture and metallic coloration one would be 
inclined to regard this ant as a subspecies of fusca. It should be placed 
just after F. sybzlla, which it resembles in pilosity though it differs 
in the worker phase in having a stouter body, shorter head, antennae 
and legs, larger eyes, a much broader petiole and different color and 
sculpture. The male sybilla differs from that of subcyanea in having 
much longer, broader, and more yellowish wings (10 mm. long, as com- 
pared with 8 mm. in the latter species), more pilose and more coarsely 
sculptured head and thorax, broader gaster and somewhat more com- 
pressed petiole. 
ForMICA RUFIBARBIS Fabr. var. GNAVA Buckley. (Page 518). 
Workers and winged females indistinguishable from the more north- 
ern specimens of this variety were taken by Mr. Mann at Guerrero 
Mill and El Chico in Hidalgo, nesting under stones or in mound-nests. 
The colonies were less populous than those of F. subcyanea. 
ForMICA CINEREA Mayr var. ALTIPETENS Wheeler. (Page 523). 
A few workers found by Mr. Mann running on cactus at Pachuca 
in Hidalgo agree very closely with the types of this variety from 
Colorado. 
