WHEELER: THE ANTS OF ALASKA. 21 



Postscript. Just after correcting the first proof of this paper Mr. 

 S. A. Rohwer informed me that he had succeeded in finding in the 

 U. S. N. M. the types of the varieties of ants described by Pergande 

 from Alaska and that he was sending me paratypes of Lasius sitkaen- 

 sis, Myrmica lobifrons, and Leptothorax kincaidi and a couple of work- 

 ers identified by Pergande as belonging to Myrmica sulcinodoides. 

 The conclusions I have reached from a study of the specimens may 

 be briefly stated: 



(1). Myrmica brevinodis var. sulcinodoides Emery. The speci- 

 mens from Sitka referred by Pergande to this variety differ somewhat 

 in color from the form I regard as typical sulcinodoides, as they have 

 the head and gaster dark brown, instead of black, and the remainder 

 of the body and appendages yellowish brown instead of deep red. 

 I should be inclined to refer them to the var. subalpina Wheeler, but 

 as Pergande refers to differences of color in his series, the specimens 

 before me may be somewhat immature. 



(4). Myrmica scabrinodis subsp. lobicornis var. lobifrons Per- 

 gande. The types and paratypes are from Metlakahtla and the two 

 of the latter received from Mr. Rohwer belong to different species 

 which were not distinguished by Pergande. One is identical with 

 M. scabrinodis lobicornis var. glacialis Forel as I find by comparison 

 with a cotype from Vermillion Pass, Alberta, received from Professor 

 Forel many years ago. The var. glacialis Forel therefore becomes 

 a synonym of lobifrons Pergande. The other specimen belongs to 

 Myrmica brevinodis and agrees perfectly with the cotypes of the var. 

 kuschei described above. That Pergande really based his variety on 

 a specimen with the antennal scape toothed at the base, is shown by 

 his attaching the form to Myrmica sabuleti. 



(5). Leptothorax acervorum subsp. canadensis var. kincaidi Per- 

 gande. Two worker paratypes from Metlakahtla agree closely with 

 the specimens recorded above from Skagway and White Pass in size, 

 form, and sculpture, but the latter have the light portions of the body 

 and appendages paler and more reddish and there are no traces of 

 infuscation on the thoracic dorsum and the summits of the petiolar 

 and postpetiolar nodes. The Pergande specimens also have the legs 

 without the short, erect or suberect hairs which are clearly visible in 

 the specimens taken by Mr. Kusche. The latter, therefore, are more 

 like the typical canadensis. 



(6). Lasius niger var. sitkaensis Pergande. The interpretation 

 of this variety given in my recent paper, "The mountain ants of 

 western North America" (Proc. Amer. acad. sci. 1917, 52, p. 524), 



