1903.] NATURAL SCIENCES OF PHILADELPHIA. 227 



the first somewhat shining in the middle near its anterior border and in 

 the regions of the parapsidal furrows. On the epinotum, about the 

 bases of the spines, the rugse become very coarse and reticulate. Epi- 

 notal spines short and blunt, resembhng those of the worker in shape 

 and direction. Petiolar node pointed, with rather flat anterior and 

 posterior slopes, coarsely reticulate rugose. Sculpture of postpetiole 

 less pronounced than that of the petiole, but coarser than the petiole 

 of the worker. Pilosity short, like that of the worker, but the hairs on 

 the head, thorax and pedicel are less clavate. Head, thorax, abdomen, 

 femora and antennal club, black, remaining portions of the legs and 

 the funicle, brown. 



Type locality : "Canada." 



Additional locahties: Elk county. Pa. (Bradley); Olympia, Wash. 

 (Kincaid). 



This form should, I believe, be regarded as belonging to the same 

 species as the European acervorum, as suggested by Andre. As Emery 

 claimed, however, it deserves to rank as a subspecies, and not as a 

 variety. The workers differ from the European specimens of acer- 

 vorum in my collection (from Switzerland (Forel) and Scotland 

 (Dughch)) in the shorter epinotal spines, the much deeper coloration of 

 the thorax, pedicel and legs, the shorter and more clavate hairs on the 

 trunk and the minute, appressed, instead of suberect hairs on the 

 antennal scapes and legs. My specimens of the North American form 

 average nearly as large as the European. 



This subspecies is certainly rare in the Eastern States, but seems to 

 be very common in Washington, to judge from the number of different 

 nests sent me from that state by Prof. Kincaid. This is probably sig- 

 nificant in connection with the palearctic distribution of acervorum. 



The habits of the American subspecies are unknowTi. They prob- 

 ably resemble those of the European form, which lives in small colo- 

 nies under bark, in moss, etc. 



3a. Var. yankee Emery. 



L. canadensis Prov. var. yankee, Zool. Jahrb., VIII, '94, p. 319. ? 9 . 



The worker (fig. 5) differs from the worker of canadensis typ. in 

 lighter coloration and in having somewhat longer epinotal spines. 

 Head dark-brown, gaster somewhat paler; mouth, thorax, pedicel and 

 legs reddish; antennal club, thoracic dorsum and femora usually 

 infuscated. Sculpture finer and less rugose than in canadensis. In the 

 female the thorax is dark-brown, the sculpture more pronounced. 



Type localities: South Dakota, Utah, Colorado. 



