222 



2; 1 Peace River Landing, l; 2 Lake Majua, Belvedere, 6; 2 Edmonton, 4. 2 Sas- 

 katchewan: Last Mountain Lake, 2. 2 



Remarks. — Specimens from central Alberta have hitherto been 

 referred to plesius (Oberholser, Auk, vol. 14, p. 192, 1897) and to 

 iliacus (Ridgway, Bull. 50, U. S. Nat. Mus., pt. 3, p. 493, 1904; 

 Preble, N. A. Fauna No. 27, p. 484, 1908; Macoun and Macoun, 

 Cat. Can. Birds, p. 708, 1909). 



Intergradation with iliacus seems to take place in south central 

 Saskatchewan. Specimens from Last Mountain Lake and 

 Kutawagan Lake are apparently intermediate, two from the first- 

 mentioned locality being nearer to laingi, and three from Kuta- 

 wagan Lake perhaps nearer to iliacus. The area of intergradation 

 may coincide with the approximate boundary between the 

 prairies on the east and the plains on the west. 



May, June, an*d July, specimens of laingi exhibit a much more 

 abraded condition of plumage than do specimens of other sub- 

 species taken during the same months. 



So far as known, the Athabaska Delta is the northernmost 

 locality at which any Marsh Wrens breed. In Alberta none have 

 been recorded previously from a more northerly point than Peace 

 River Landing. 



I am under obligations to Dr. Jonathan Dwight, to Mr. Outram 

 Bangs, of the Museum of Comparative Zoology, and to Mr. P. A. 

 Taverner, of the Victoria Memorial Museum, for the privilege of 

 examining comparative material in the collections under their 

 charge. 



Boston Society of Natural History. 



1 Mus. Comp. Zool. 2 Victoria Mem. Mus. 



