IV BULLETIN 174, UNITED STATES NATIONAL MUSEUM 



Family Picidae : American woodpeckers — Continued. Page 



Dryobates pubescens turati: Willow woodpecker 69 



Habits 69 



Dryobates borealis : Red-cockaded woodpecker 72 



Habits 72 



Distribution 79 



Dryobates scalaris symplectus: Texas woodpecker 79 



Habits 79 



Distribution 81 



Dryobates scalaris lucasanus: San Lucas woodpecker 82 



Habits 82 



Dryobates scalaris cactophilus: Cactus woodpecker 83 



~ Habits 83 



Dryobates scalaris eremicus: San Fernando woodpecker 86 



Habits - 86 



Dryobates nuttalli: Nuttall's woodpecker 87 



Habits 87 



Distribution 91 



Dryobates arizonae arizonae: Arizona woodpecker 91 



Habits 91 



Distribution 96 



Dryobates albolarvatus albolarvatus: Northern white-headed wood- 

 pecker 97 



Habits 97 



Distribution 104 



Dryobates albolarvatus gravirostris: Southern white-headed wood- 

 pecker 105 



Habits 105 



Picoides arcticus : Arctic three-toed woodpecker 106 



Habits 106 



Distribution 115 



Picoides tridactylus bacatus: American three-toed woodpecker 116 



Habits 116 



Distribution 121 



Picoides tridactylus fasciatus: Alaska three-toed woodpecker 122 



Habits 122 



Picoides tridactylus dorsalis: Alpine three-toed woodpecker 124 



Habits 124 



Sphyrapicus varius varius: Yellow-bellied sapsucker 126 



Habits 126 



Distribution 139 



Sphyrapicus varius nuchalis: Red-naped sapsucker 141 



Habits 141 



Sphyrapicus varius daggetti: Southern red-breasted sapsucker 146 



Habits 146 



Sphyrapicus varius ruber: Northern red-breasted sapsucker 151 



Habits 151 



Sphyrapicus thyroideus thyroideus : Williamson's sapsucker 154 



Habits 154 



Distribution 160 



Sphyrapicus thyroideus nataliae: Natalie's sapsucker 162 



Habits _ 162 



