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. 



Male. 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. subscricea. 

 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 wdrker 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. sybilla, 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. 



