118 BisHop, New Birds from Alaska. Api 
The only specimen of 7ichardsont trom anywhere near the type 
locality that I have seen is a migrating female taken in Towner 
Co., N. Dak., June 4, 1895, by Mr. Homer L. Bigelow of Bos- 
ton, and now in his collection. This bird has the mandible yel- 
low, and is fully as pale as rvichardsonii from Arizona, but has a 
bill as small as the extreme of saturatus. 
Measurements of this bird are:— Wing, 3.43; tail, 2.735 
exposed culmen, .42 ; bill from nostril, .34; width of bill at base, 
-30'; (tarsus, ..9 3) Inches. 
Parus hudsonicus evura Cowes. YUKON CHICKADEE. 
This subspecies was separated by Dr. Coues in the second 
edition of his ‘ Key’ on the basis of Alaskan specimens of hudson- 
icus being larger than those from the East. This difference, 
though existing and most marked in the size of the bill, is very 
slight. But there are marked differences in the plumage of the 
young and of adults in late summer that require the recognition 
of the two forms. 
In worn breeding plumage Yukon birds closely resemble those 
from eastern North America, varying greatly individually in the 
coloring of the forehead and orbital region, but average slightly 
deeper black on the throat. 
After the summer moult Zudsonicus from the East goes into a 
plumage similar to that worn in winter and spring; evwra, on the 
contrary, becomes of a color between dark hair-brown and drab on 
the crown and nape, entirely wanting the rusty of Audsonicus, and 
has less buffy on the back. 
Winter birds from the Yukon, also Fort Raé and Fort Simpson, 
have reached a plumage having the rusty hair-brown head and 
back of winter Audsonicus from Ungava, Labrador, but average 
slightly paler above especially on the head. I fail to see any 
difference in the shade of the black throat, the chestnut of the 
sides, gray of side-neck or white of side-head. A single speci- 
men taken at Fort Yukon, September ro, now in the U. S. Nat. 
Mus. Coll., is indistinguishable from winter birds from the same 
region, and the type of P. h. stoneyi differs only in having paler 
flanks. A bird taken at Fort Kenai, Alaska, May ro, closely 
resembles spring Audsonicus from the East — Ungava, New Bruns- 
wick, etc. 
