18 bulletin: museum of comparative zoology. 



darker, with the sculpturing of the head and thorax coarser and the 

 hairs stouter and shorter." He cites no locahty for the types (No. 

 5279, U. S. N. ]\I.), which seem to be lost. As sabuleti is itself now 

 regarded as merely a variety of scabrinodis, it is clear that lobifrons 

 must be referred to some other form. I conjecture that it is a variety 

 of lobicornis, which I have recently shown (Proc. Amer. acad. sci., 

 1917, 52, p. 504) to be actually represented in America by Forel's 

 var. glaeialis of the Rocky Mts. and Sierra Nevada. Perhaps glacialis 

 is merely a synonym of lobifrons, but this can be determined only if 

 Pergande's types are found or by further collecting in Alaska. 



5. Leptothorax acervorum Nylander subsp. canadensis Pro- 

 vancher var. kincaidi Pergande. 



This variety was described as L. yankee Emery var. kincaidi from a 

 female and twelve workers taken by Professor Kincaid at Metlakahtla. 

 I have recorded it from the Upper Kugarok River, near Nome (65° 

 N. L.) where it was taken by Mr. F. H. Whitney. Numerous workers 

 taken by Mr. Kusche at Skagway and White Pass agree even more 

 closely with Pergande's description, as they are somewhat smaller 

 and lack the crescentic black spot on the pronotum. Perhaps the 

 more northern specimens should be regarded as a distinct variety. 



6. Lasius NIGER Linne var. sitkaensis Pergande. 



This form, not represented among the specimens collected by Mr. 

 Kusche, was described by Pergande as a subspecies of L. niger from 

 twenty-five workers taken at Sitka. As stated in my recent paper 

 on the mountain ants, I believe it to be identical with a form which 

 I have found to be common throughout the Canadian zone. Pergande 

 mentions its similarity to Lasius suhniger of Maine {rede neoniger 

 Emery). If I am right in my identification of the Alaskan form it 

 is merely a variety and not a subspecies of the typical Eurasian niger. 



7. Formica sanguinea Latreille subsp. subnuda Emery. 



Mr. Kusche secured many workers of this subspecies from several 

 colonies at Skagway and White Pass, Alaska and White Horse, Yukon. 



