wheeler: ants of the genus formica. 407 



slightly more yellowish than in the European t^-pe; the head not 

 darker than the thorax; mandibles but little darker than the head. 

 Gaster black. 



Female. Length 7-9 mm. 



Very similar to the worker in sculpture, pilosity, and color. Space 

 between frontal carinae and sometimes also the clypeus infuscated; 

 mesonotum usually immaculate; antennae and tibiae brownish; 

 wings infuscated at the base, in some specimens more strongly than in 

 the European type. 



Male. Length 7-9 mm. 



IVIandibles broad, dentate; clypeus carinate, convex, its anterior 

 border feebly emarginate. Closely resembling the European type 

 in color and pilosity, but the gaster is more shining, owing to its some- 

 what sparser pubescence. Petiole much thicker and with a blunt 

 border, which is more faintly excised or sometimes even entire and 

 trans\erse. Antennae black throughout, mandibles reddish only at 

 their tips, which are dentate as in the tj^pe. Legs in mature specimens 

 sordid yellow, with the femora more or less infuscated basally. Geni- 

 talia yellow, the appendages infuscated at their tips. Wings as in 

 the female. 



Hosts (Slaves). F. fusca var. subsericea; F. cinerea var neocinerea; 

 F. neogogates; F. imUidcfuha schaufussi and var.fuscata. 



Type locality. — Pennsylvania (Emery). 



New Jersey: MilltowTi (W. T. Davis); Delaware \Yater Gap 

 (H. L. Viereck); Woodbury (Phila. Acad. Coll.); Newfoundland 

 (Wheeler). 



North Carolina: Black Mts. and Panther Gap, Blue Ridge (W. 

 Beutenmiiller). 



Massachusetts: Ellisville, Woods Hole, Blue Hills (Wheeler); 

 Springfield, Holyoke (G. B. King). 



Connecticut: Colebrook (Wheeler). 



Michigan: Marquette (M. Downing). 



Illinois: Rockford (Wheeler). 



Colorado: Prospect Lake, Colorado Springs (Wheeler). 



Montana: Helena (W. M. Mann). 



Ontario: Guelph (W. H. Wright). 



This subspecies, which is not as common as the subspecies s^lb- 

 intcgra or even suhnuda, varies considerably in different colonies 

 in the color and character of the pilosity. Thus in my workers from 

 the Black Mountains of North Carolina the hairs on the gaster are 

 gray, very slender, and pointed, whereas in specimens from most other 

 localities they are brilliant golden yellow. Emery cites a single 



