150 VERTEBRATES: BIRDS. 



above and white beneath ; the crown with a square 

 yellow patch, a white stripe behind the eye, and another 

 beneath it ; the quills spotted with white ; and the sides 

 banded transversely with black. 



The Black-backed Three-toed Woodpecker, P. arcticus, 

 Gray, of Northern North America, is nine and a half 

 inches long, the wing five inches, and is distinguished by 

 its black back. 



The Banded Three-toed Woodpecker, P. hirsutus, Gray, 

 of the Arctic regions of North America, is about nine 

 inches long, the wing four and three fourths inches, and 

 the back transversely banded with white. 



The Striped Three-toe^ Woodpecker, P. dorsalis, Baird, 

 of the Rocky Mountains, is nine inches long, the wing 

 five inches, and the back streaked longitudinally with 

 white. 



The Genus Sphyrapicus comprises Woodpeckers which 

 have the lateral ridge of the bill very prominent, but ter- 

 minating at the middle of the commissure ; the outer 

 pair of toes longest, inner posterior one very short, wings 

 long and pointed, fourth quill longest, the tail feathers 

 very broad, abruptly acuminate, and with a long point. 

 The colors are black and white, with a central yellow line 

 on the belly. 



The Yellow-bellied Woodpecker, 5. varius, Baird, of 

 North America east of the Rocky Mountains, is eight 

 and a quarter inches long, the wing about four and three 

 quarters inches, and, in addition to characteristics before 

 mentioned, it has the crown red bordered with black, 

 chin and throat red, a black patch upon the breast, and 

 the outer and inner tail feathers varied with white. 



The Red-breasted Woodpecker, 5. ruber, Baird, of 

 Western North America, is less than nine inches long, 

 the wing five inches, the head, neck, and breast red. 



Williamson's Woodpecker, 5. Williamsonii, Baird, of 



