wheeler: ants of the genus formica. 399 



Length 3.5-6 mm.; gaster somewhat bronzy, shghtly shining, 

 with shorter pubescence rufibarbis var. gnava Buckley. 



24. Thorax entirely black fusca var. subaenescens Emery. 



Thorax more or less red 25 



25. Thorax clear, yelloudsh red throughout. 



fusca var. necrufibarbis Emery. 

 Thorax of large workers infuscated or black anteriorly. 



fusca var. gclida, var. nov. 



26. Body opaque or subopaque, head of largest workers not rec- 



tangular 28 



Body shining, head of largest workers rectangular 27 



27. Thorax brownish red or dark chestnut subpolita Mayr. 



Thorax yellow or yellowish brown, head of largest workers with 



more nearly parallel sides. 



subpolita var. camponoticeps, var. nov. 



28. Antennal scapes with erect hairs, eyes densely hairy. 



cinerea pilicornis Emery. 

 Antennal scapes without erect hairs, eyes not hairy 29 



29. Erect hairs abundant on head and thorax; length 3.5-6 mm. . . 30 

 Erect hairs very sparse on head and thorax; length 5-6.5 mm. 



sibylla, sp. nov. 



30. Gaster blackish or dark brown; frontal area opaque 31 



Gaster pale reddish brown, not infuscated above; frontal area 



shining montana Emery, 



31. Petiole broad, seen from behind cordate, notched in the middle. 



cinerea var. altipetens, var. nov. 



Petiole narrower, with blunt margin, usually entire or obtusely 



angular in the middle 32 



32. Suberect hairs absent on sides of head and flexor surfaces of legs. 



33 

 Suberect hairs present on sides of head and flexor surfaces of legs. 



cinerea var. lepida, var. nov. 



33. Body dark brownish, top of head and gaster blackish. 



cinerea var. neocinerea Wheeler. 



Body light yellowish red, top of head, pronotum, and gaster 



brown cinerea var. rutilans, var. nov. 



Subgenus Proformica. 

 Workers. 



1 . Palaearctic forms 2 



Nearctic forms 8 



