Peete Banos, The American Three-toed Woodpeckers. 131 
have examined a few skins from other places with light yellow 
crown patches. It is probably a character of the young male, 
though I have not seen enough carefully dissected specimens to 
be sure of this. 
The range of seasonal variation in P. arcticus is likewise small. 
Winter specimens are, of course, in a fuller and longer plumage 
than summer ones, and examples in worn, faded mid-summer 
plumage are somewhat browner on the back and wings. 
In the Cascade Mountains and Sierra Nevada of California 
true P. arcticus is replaced by a form having a peculiarly slender 
bill. 
Picoides arcticus tenuirostris, subsp. nov. 
Type, from Fort Klamath, Oregon, No. 19576, g adult, Coll. of Wm. 
Brewster. Collected Dec. 13, 1886, by Dr. J. C. Merrill, U.S. A. 
Geographic Distribution, — Cascade Mountains and Sierra Nevada of 
California, south to Lake Tahoe. 
Specimens examined. — Total number, 4; all from the type locality. 
Subspecific characters.— Averaging a little larger than true P. arcte- 
cus (wing of adult @, 130.5 mm., of adult 9, 125 mm.); similar to true 
P. arcticus in color, except that the nasal plumes are blacker — less 
mixed with white; differing widely from true P. arcticus in the shape of 
the bill, which is long and extremely slender (greatest width of bill in 
true P. arcticus, @ ad. being 11.2 mm.; in P. arcticus tennirostris & ad. 
8.8 mm.). See cut. 
A. Bill of P. arcticus arcticus (No. 4525, Bangs Coll., from Red Deer 
Alberta, @ ad.). 
B. Bill of P. arcticus tenuirostris. (Type, & ad.). 
Remarks. — That such a stable species as true P. arcticus, 
which does not vary from the Atlantic to the Rocky Mountains, 
