414 bulletin: museum of comparative zoology. 



Hosts (Slaves). F. fusca vars. argentea, suhaenescens, and neo- 

 clara; F. cinerea var. neocinerea; F. paUidcfulva nitidiventris; F. 

 neogagates lasioides var. ridiia. 



Type locality. — South Dakota: Hill City, (Emery). 



Colorado: Manitou, Colorado Springs, Cheyenne Canyon, Ute 

 Pass, Woodland Park (Wheeler); Breckenridge, West Cliflf (P. J. 

 Schmitt). 



Utah: Stockton (T. Spalding). 



Washington: Pullman (W. M. Mann) ; Olympia (T. Kincaid). 



Montana: Helena (W. M. Mann). 



New Mexico: Manzanares (Miss Mary Cooper); Alamogordo 

 (G. V. Krockow); Gallinas Canyon (T. D. A. Cockerell). 



Texas: Ft. Davis (Wheeler). 



Missouri: Doniphan (P. J. Schmitt). 



Illinois: Rockford (Wheeler). 



This subspecies replaces suhintegra at lower altitudes and in warmer 

 situations in the Western States. Occasionally one finds specimens 

 of the latter form which approach puberula in the somew^hat longer 

 pubescence on the legs and the more abundant hairs on the body. 

 I have taken such specimens at Lakehurst, N. J. The males of 

 puberula from Illinois are abnormally small (7 mm.), and in the shape 

 of the clypeus resemble suhintegra. Apart from the conspicuous dif- 

 ferences in pilosity, the workers of the two forms can be separated in 

 nearly all instances by the pubescence, which, on the anterior surfaces 

 of the tibiae, is very fine, dense, and appressed in suhintegra, but 

 distinctly longer, sparser, coarser, and more oblique in puberula, so 

 that in this form it takes on the appearance of minute hairs. I have 

 seen no specimens of puherula which show this condition also on the 

 antennal scapes ; on these organs the fine, dense pubescence is merely 

 a little longer but scarcely more oblique than in suhintegra. 



13. F. sanguinea obtusopilosa Emery. 



F. sanguinea subsp. obtusopilosa Emery, Zool. jahrb. Syst., 1893, 7, p. 648, ^ ; 

 Wheeler, Ants, 1910, p. 458, 570. 



Worker. Mandibles finely striated, feebly punctate. Clypeus 

 rather deeply and broadly notched. Petiole narrow and thick, with 

 blunt superior border, resembling the petiole of F. paUidefidxa. 

 Gaster opaque, with feeble metallic luster, its pubescence not dense 

 but long and whitish. Erect hairs more abundant than in the other 

 subspecies, whitish yellow, all nearly of the same length, enlarged 



