wheeler: ants of the genus formica. 405 



than in the typical sanguinea. Antennal scapes slender at the base, 

 somewhat enlarged towards theu' tips. Head relatively large in large 

 workers, almost broader than long, excluding the mandibles, with con- 

 vex sides, rounded posterior corners and straight or feebly excised 

 posterior border. Petiole broad, with sharp, entire or feebly excised 

 superior border. 



Sculpture a little finer than in the typical sanguinea; head and 

 gaster more shining; punctures on the occiput rather distinct, scat- 

 tered. 



Hairs yellowish, very sparse, usually absent on the thorax and 

 petiole; short on the gaster. Pubescence shorter and more dilute 

 than in the typical sanguinea, so that the surface, especially that of 

 the gaster, appears more shining; very fine and appressed on the legs 

 and scapes. 



Color brownish red like that of deeply colored specimens of the 

 typical form; posterodorsal portion of head and often also the middle 

 of the pronotum infuscated or blackened. 



Female. Length 7-8 mm. 



Sculpture, pilosity, and color as in the worker; metanotum, pos- 

 terior border of pronotum, and scutellum and three spots on the 

 mesonotum dark brown or black. Head, excluding the mandibles, 

 as broad as long, broader behind than in front, with straight posterior 

 and lateral borders. Scale of petiole broad, much compressed antero- 

 posteriorly, with thin, sharp, entire or feebly emarginate border. 

 Wings colored as in the typical sangui?iea. 



Male. Length 8-8.5 mm. 



Mandibles broad, dentate. Clypeus convex, carinate; emargina- 

 tion of its anterior border feeble but distinct. Petiole thick, with 

 rather sharp, transverse border. Hairs and pubescence very short 

 and sparse, so that the thorax and gaster are more shining than in the 

 typical sanguinea; head including the mandibles, opaque. Body and 

 antennae black; tips of mandibles brownish; legs brownish yellow. 

 Genitalia rather deeply infuscated. Wings colored like those of the 

 female. 



Hosts (Temporary). F. fusca and its var. subsericea. 



Type locality. — Ontario: Toronto, (Forel). 



Nova Scotia: Round Hill; Clark's Harbor, Cape Sable Island 

 (A. Halkett). 



New Brunswick: Grand Manan (Centr. Exper. Farms Coll.). 



Maine: South Harpswell (Wheeler). 



New Hampshire: Franconia (Mrs. A. T. Slosson); Summit of Mt. 

 Washington (C. S. Bacon and Mrs. A. T. Slosson). 



Massachusetts: Mt. Wachusett (A. C. Burrill). 



