512 WHEELER. 



Utah: Little Willow Creek, Salt Lake Co (R. V. Chamberlin). 



Maine: Orono (H. H. Severin). 



New Hampshire: Franconia and summit of Mt. Washington (Mrs. 

 A. T. Slosson). 



This species was originally described from Canada. The following 

 smaller and darker variety is also widely distributed through the Can- 

 adian Zone but seems to be rare and local : 



47. Leptothorax (MychotJiorax) accrvorum subsp. canadensis var. 

 convivialis Wheeler. 



Wisconsin: Milwaukee, type locality (Wheeler). 



New Mexico: Beulah, 8000 ft. (F. W. P. Cockerell); Top of Las 

 Vegas Range, 11,000 ft. (T. D. A. Cockerell). 



Connecticut: Colebrook (Wheeler). 



Nova Scotia: Digby (J. Russell). 



Newfoundland: Spruce Brook. 



This form was described as L. canadensis subsp. ohscurus by Viereck 

 in a paper on the Hymenoptera of Beulah New Mexico (Trans. Amer. 

 Ent. Soc. 29, 1903) which appeared a month later than my revision 

 of the species of Leptothorax. 



48. Leptothorax (Mychothorax) acervorum subsp. canadensis var. 

 kincaidi Pergande. 



Four workers and a dealated female taken by Mr. F. H. Whitney on 

 the Upper Kugarok River, north of Nome, Alaska (65°!) are clearly 

 referable to this variety, originally described from Metlakahtla. Both 

 phases are larger (worker 3 mm.; female 4 mm.) and more coarsely 

 sculptured than our other North American forms. In my workers 

 the reddish brown thorax has a black crescent on the pronotum and the 

 upper surface of the epinotum and the petiole and postpetiole are of 

 the same color. The epinotal spines are long, thick and blunt, the 

 antennal scapes reach only a little more than half the distance between 

 the eyes and posterior corners of the head. The hairs on the legs are 

 short, coarse and suberect. 



49. Leptothorax {Mychothorax) acervorum subsp. canadensis var. 

 yankee Emery. 



British Columbia: Glacier (Wheeler); Rogers Pass and Prairie 

 Hills, Selkirk Mts. and Carbonate (J. C. Bradley). 



Alberta: Lake Louise and Moraine Lake, Valley of the Ten Peaks 

 (Wheeler). 



