164 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. IX. 



Toes, three ; crown, black ; back, black, without white. 



Picoides arcticus (female). 

 Arctic Three-toed Woodpecker. 

 See No 191. 



Picoides americanus. 



Toes, three; crown, yellow; back, black and white. 



Picoides americanus (male). 



American Three-toed Woodpecker. Banded-backed Woodpecker. 



See No. 192. 



Toes, three; crown, black, marked with white; back, black and 



white. Picoides americanus (female). 



American Three-toed Woodpecker. Banded-backed Woodpecker. 



See No. 192. 



SECTION 2. The following species have four toes; no trace of red 



on crown or nape: 



Ear coverts, black; 



no white on inner 

 web of two middle 

 tail feathers; middle 

 of back, more or less 

 white, but not heavi- 

 ly banded as in borea- 

 lis; lower rump and 

 upper tail coverts, 

 black. 



Dryobates villosus (fe- 

 male ) . 



Hairy Woodpecker. 

 See No. 189. 



