408 bulletin: museuim of comparative zoology. 



worker from Labrador as belonging to rvbicunda, but I believe that 

 it was more probably a specimen of the subspecies submida. I prefer 

 to cite Pennsylvania as the type locality because it falls within the 

 range of ruhicunda as indicated by my material and because Emery 

 utilized in his description several worker and female specimens from 

 that state. 



I have shown that the female rubicunda founds her colony by kid- 

 napping and rearing the pupae of F. fusca var. subsericea. After the 

 colony is thus established the workers of rubicunda make periodical 

 dulotic raids on colonies of subsericea and by rearing its pupae main- 

 tain a mixed colony. I have always taken rubicunda with F. sub- 

 sericea, neogagates or schaufussi as slaves except at Colorado Springs, 

 Colo., where the colonies on the shores of Prospect Lake contained 

 instead F. cinerea var. neocinerea. 



8. F. SANGUiNEA RUBICUNDA var. SUBLUCIDA, var. nov. 



Worker. Length 5.5-6.5 mm. 



Differing from the worker of the typical rubicunda in the more 

 shining surface of the body, especially of the mandibles, frontal area, 

 head, and gaster. The hairs and pubescence are well developed but 

 grayish, and the pubescence is much sparser on the gaster. The 

 head is proportionally larger, with more rounded sides and posterior 

 corners, the clypeal notch is shallower and the thorax seems to be more 

 slender; the petiole is narrower and has a blunter superior border, 

 much like the petiole of the subspecies subintegra. The body is light 

 red, with deep black gaster and brownish legs. 



Female (dealated). Length 8-9 mm. 



Closely resembling the female of rubidunda but the thorax is pro- 

 portionally smaller and narrower. The pubescence on the head, 

 thorax, and gaster is longer than in the worker so that these parts 

 appear to be less shining. One specimen has three fuscous spots on 

 the mesonotum, the other has this region immaculate. The petiole 

 is much like that of the worker and not so broad and sharp as in rubi- 

 cunda. 



Host (Slave). F. fusca var. subsericea. 



Described from two females and several workers taken from a 

 single colony on the Stony Brook Reservation, near Boston, Mass. 

 This form may deserve to rank as a distinct subspecies when more 

 material is available. The frontal area is very smooth for a sanguinea, 

 almost as smooth and shining as in the rufa forms. The thorax is 

 rather slender and recalls the structure of this region in F. munda and 

 F. pergandei. 



