Appendix. 



Z, No black patch on gray breast. 



a. Head black and white, scarlet on 

 head of male. 



Nuttall's Woodpecker . 47 



I>. Head grayish brown ; belly yellow. 



Gila Woodpecker . . 56 



III. Back streaked or spotted black and 

 whitish, the white sometimes tinged with pale 

 yellow. Belly generally pale yellow ; head 

 and throat of male carmine red. 



1. A black patch on breast more or less dis- 

 tinct. 



Red-naped Sapsucker . . 50 



2. No black patch; head and breast of adult 

 male entirely carmine. 



Red-breasted Sapsucker . 5 1 



B. Back black, with lustrous tones of greenish or 

 bluish, or dark brownish black. 



I. Rump or upper tail-coverts white. 



1. Throat-patch scarlet or white. Fore- 

 head black. 



Male Williamson's Sapsucker 52 



2. Chin black; a broad throat crescent of 

 white tinged with sulphur yellow. Forehead 

 white. 



California Woodpecker . 54 



II. Rump black like back. 



1. Head white all around. 



White-headed Woodpecker . 48 



2. Head with yellow crown in male; sides 

 barred black and white. 



Arctic Three-toed Woodpecker 49 



288 



