March, 1919] A Key to Wisconsin Ants 285 



F. pergandei Emery. 



The writers have not seen specimens of this species, although 

 it is known to occur in Wisconsin. Wheeler states that this 

 species is rare. 



F. sanguinea subnuda Emery. 



This species is a Boreal or Alpine form and is not very easily 

 distinguished from F. aserva. 



It makes slaves of F. fusca vars. subsericea, argentea, sub- 

 aenescens, and gelida. 



F. sanguinea rubicunda Emery. 



Workers of this subspecies vary in color and character of 

 pilosity. This subspecies is not as abundant as the subspecies 

 subi7itegra and subnuda. 



F. subsericea, neogagates, schufussi and neocinerea are its 

 slaves. 



F. sanguinea subintegra Emery. 



F. subintegra may be distinguished from rubicimda by the 

 smaller size, peculiar color of the gaster and the narrower 

 blunter petiole of the worker. 



It is the common form of sanguinea in the Eastern States 

 and Canada at low elevations in warmer situations. 



The following species are made slaves of by F. subintegra, 

 F. fusca and vars. subsericea, subaenescens, F. cinerea neocinerea, 

 neogagates, vidua; F. pallide-fulva schaufussi, nitidiventris, fuscata 

 and incerta. 



Exsecta Group. 



1. Posterior portion of the head black ulkei Emery. 



Posterior portion of the head not black exsectoides exsectoides Forel. 



F. ulkei Emery. 



Wheeler states that this species is peculiar to the Canadian 

 fauna but is very rare in the Transition Zone. 



The nests are flattened mounds a foot or more in diameter, 

 composed of earth and vegetable matter. 



A larva of Coscinoptera dominicana Fabr. was found in the 

 nest of this species. 



F. exsectoides exsectoides Forel. 

 F. exsectoides is the famous mound building ant of the 

 Alleghany Mountains, of whose interesting habits Rev. H. C. 



