366 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



d. Smaller and browner (wing averaging less than 136, tail averaging less than 

 127; back, etc., deep hair-brown to almost sepia, under parts brownish 

 white). (Coast of northern California, Oregon, Washington, and British 



Columbia.) Perisoreus obscurus obscums, adults (p. 372) 



dd. Larger and grayer (wing averaging more than 139.5, tail averaging more 

 than 133.5; back, etc., deep mouse gray, under parts grayish white). 

 (Interior of British Columbia, Washington, Oregon, and northern Cali- 

 fornia. ) Perisoreus obscurus griseus, adults (p. 373 ) 



hi). Forehead, sides of head, throat, and chest dusky grayish, or mostly so. 

 (Young.) 

 c. Feathers of back with distinct paler shaft-streaks. 



d. Browner Perisoreus obscurus obscurus, young (p. 372) 



dd. Grayer Perisoreus obscurus griseus, young (p. 373) 



cc. Feathers of back without paler shaft-streaks. 

 d. Crown not paler than back (usually darker). 

 e.. Less dark. 

 /. General gray color more slaty. 



Perisoreus canadensis canadensis, young (p. 366) 

 ff. General gray color more l")rownish. 



Perisoreus canadensis fumifrons, young (p. 369) 



ee. Darker Perisoreus canadensis nigricapillus, young (p. 368) « 



dd. Crown paler than back Perisoreus canadensis capitalis, young (p. 370) 



PERISOREUS CANADENSIS CANADENSIS (Linnaeus). 

 CANADA JAY. 



Adult. — Forehead (including nasal tufts), fore part of crown, loral, 

 suborbital, auricular and malar regions, chin, throat, and chest white; 

 hindneck, occiput, posterior portion of crown, and postocular region 

 dull brownish slate-black or blackish slate, more or less tinged with 

 gray anteriorly, next to white of forehead; back, scapulars, lesser 

 wing-coverts, rump, and upper tail-coverts plain mouse gra}", paler 

 next to the blackish of the hindneck; wings and tail slate-gray, the 

 primaries slightly more bluish; remiges and rectrices tipped (not 

 abruptl}^) with white, the middle and greater wing-coverts also some- 

 times tipped with white, but much more narrowly; under parts of body 

 plain drab-gray, paler (almost, sometimes quite, white) on anal region 

 and under tail-coverts; bill, legs, and feet black; iris brown. 



Young. — Above, including pileum and hindneck, slate color or 

 brownish slate; nasal plumes, and loral. orbital, and auricular regions 

 slate-blackish; under parts, including chin, throat, and chest, plain 

 brownish slate-gra}', the under side of head sometimes slightly mixed 

 with whitish; wings and tail as in adults, but whitish tips to remiges 

 and rectrices less distinct; bill partially light-colored. 



Adult ma/e. --Length (skins), 266! 5-289. 5 (276); wing, 142-148 

 (145.5); tail, 135-151 (144.5); exposed culmen, 21.5-22.5 (22); depth 

 of bill at base, 10-12 (11); tarsus, 34-37 (35.5); middle toe, 17-19 (18).* 



c The differences between the young of these forms are by no means well defined, 

 but they average as above. 

 '' Six specimens. 



