wheeler: ants of the genus formica. 417 



Head, thorax, and antennae red; petiole and gaster black, the former 

 often with a reddish tinge. Mandibular teeth black. Lower pleurae 

 and in many specimens also the vertex of the head, infuscated. Legs 

 red; coxae, femora, and tibiae more or less infuscated, except at the 

 articulations. 



Female. Length 7.5-8 mm. 



Head small, narrower than the thorax; antennal scapes extending 

 nearly ^ their length beyond the posterior corners of the head. Re- 

 sembling the worker in pilosity, sculpture, and coloration, except in 

 the following characters : — The hairs are of a yellowish cast, and on 

 the gaster are pointed and of the same thickness as on the head and 

 thorax, although they are long and in certain lights conspicuous, 

 especially towards the tip of the body. Pleurae clouded with fuscous; 

 posterior portion of head, posterior edge of pronotum, and anterome- 

 dian and two parapsidal blotches on the mesonotum, fuscous. 

 Metanotum and scutellum, except its anterior border, black. Petiole 

 varying from dark red to blackish, of the same shape as in the worker, 

 except that in profile its superior border is much sharper in some 

 specimens. Wings whitish hyaline, with pale brown veins and stigma. 



Type locality. — Colorado: Canyon City (P. J. Schmitt). 



Colorado: Breckenridge, West Cliff (P. J. Schmitt); Colorado 

 Springs, Salida, Boulder, Wild Horse (Wheeler); South Boulder 

 Canyon (T. D. A. Cockerell); Troublesome (S. A. RoliM^er). 



New Mexico: Glorieta, Old Pecos Pueblo (T. D. A. Cockerell). 



South Dakota: Medicine Root, Pine Ridge Ind. Reserv. (Thompson). 

 Harding County (S. S. Visher). 



Montana: Helena (W. M. Mann). 



Alberta: Medicine Hat (J. C. Bradley). 



The worker of this species differs from sanguinea and resembles 

 F. pergandei in the structure of the thorax. The head, especially of 

 large workers, is more like that of small sanguinea workers and broader 

 than in pergandei. From this latter species and from all the subspecies 

 of sanguinea, except, perhaps, obtusopilosa, munda differs in the pecu- 

 liar thick, blunt hairs, especially on the gaster. The female is readily 

 distinguished from the female sanguinea by the smaller head and longer 

 antennal scapes. Some years ago Professor Emery informed me (m 

 litteris) that the specimens which I later described as F. munda were 

 identical with the ones he regarded in his "Beitrage" as representing 

 a variety of pergandei from Colorado. I infer therefore that F. munda 

 cannot be a synonym of his F. sanguinea obtusopilosa, as one might 

 be led to believe from a study of his brief description of that subspecies. 



F. munda lives in grassy places, especially in irrigated plains and 



