550 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



ff. Wing shorter, bill and tarsus longer; color of upper parts more grayish 



or olivaceous brown. 



g. Larger; adult male averaging, wing 53.5, tail 52.3, exposed cukfien 



15.2, tarsus 20.2; adult female averaging, wing 51.1, tail 50.4, 



exposed culmcn 14.9, tarsus 19.7. (Coast district of Oregon, 



Washington, and southern British Columbia.) 



Thryomanes bewickii calophonus (i>. 566) 

 gg. Smaller; adult male averaging, wing 51.9, tail 49.7, exposed culmen 

 14.7, tarsus 19.2; adult female averaging, wing 49.2, tail 48.1, 

 exposed culmen 14.3, tarsus 18.9. (Middle coast district of Cali- 

 fornia. ) Thryomanes bewickii spilurus ( p. 565 ) 



ee. Color of ujjper parts more grayish or olivaceous brown. 

 /. Bill shorter (exposed culmen averaging less than 15 in male, not more 

 than 14.5 in female). 

 g. Upper parts more decidedly brown; bill longer (exposed cidmen 

 averaging more than 14). 

 /(. Tail longer (averaging 51.5 in male, 49.7 in female) ; color of upper 

 parts averaging more sooty brown. (California, except central 

 coast and San Diego districts. ) 



Thryomanes bewickii drymoecus (p. 563) 

 hh. Tail shorter (averaging 49.6 in male, 48.5 in female); color of 

 upper parts averaging more rufescent brown. (Santa Cruz and 

 Santa Rosa islands, California. ) 



Thryomanes bewickii nesophilus (]>. 562) 

 gg. Upper parts more grayish or olivaceous; bill shorter (exposed cul- 

 men averaging not more than 14). 

 h. Smaller (adult male averaging, wing 51, tail 52, exposed culmen 13, 

 tarsus 19; adult female averaging, wing 49.5, tail 48.5, exposed 

 culmen 12.7, tarsus 18). (Cerros Island, Lower California.) 



Thryomanes bewickii cerroensis (p. 562) 

 i. Larger (adult male averaging, wing 52.6, tail 52.8, exposed cul- 

 men 14, tarsus 19; adult female averaging, wing 49.8, tail 50, 

 exposed culmen 13.4, tarsus 18.5). (Southern California, 

 nortliern Lower California, and Santa Catahna Island. ) 



Thryomanes bewickii charienturus (p. 561) 

 ff. Bill longer (exposed culmen averaging 15.3 in male, 15 in female). 

 (San Clemen te Island, California.) 



Thryomanes bewickii leucophrys (p. 563) 

 (id. Larger (wing and tail averaging more than 55). 



e. Color of iipper parts more grayish or olivaceous brown. 

 /. Darker. 



g. Smaller (adult male averaging, wing 55.8, tail 55.2, exposed culmen 

 13.9; adult female averaging, wing 55.5, tail 55, exposed culmen 14) . 



(Southeastern Mexico.) Thryomanes bewickii bairdi (j). 559) 



gg. Larger (adult male averaging more than the above measurements). 

 }i. Wing and bill longer, tail and tarsus shorter (adult male averaging, 

 wing 59.8, tail 56.5, exposed culmen 15.5, tarsus 19.9; adult 

 female averaging, wing 56, tail 53, exposed culmen 15.5, tarsus 

 18.5); color of upper parts slightly warmer brown. (Western 

 Mexico.) Thryomanes bewickii percnus (p. 560) 



more or less faded and worn. In consequence of this seasonal difference the use of 

 color-characters in the key becomes difficult, the summer plumage of the reddest 

 form ( T. }>pwickii) being really less reddish tlian the winter jihimage of T. b. spilwus 

 and y. b. calophonus, which are the most reddish brown of the western races. 



