INSESSORES: SYLVICOLID^:. 179 



The Black-throated Gray Warbler, D. nigrescens, Baird, 

 of the Pacific coast, is four and seven tenths inches long, 

 the wing two and three tenths, the crown black, back 

 ash, superciliary and maxillary stripe white. 



B. This group comprises those which have the sides 

 and under parts of the head black. 



The Black-throated Blue Warbler, D. canadensis, Baird, 

 of the United States east of the Missouri, is five and a 

 half inches long, the wing two and six tenths, blue above, 

 white beneath, primaries with a whi.te patch at base, and 

 the sides and under parts of the head black. 



C. Those in this group have a central longitudinal 

 yellow patch on the crown. 



The Yellow-rump Warbler, D. coronata, Gray, of East- 

 ern North America to the Missouri plains, is five and six 

 tenths inches long, the wing three inches, the color slate- 

 blue above, throat white, breast blackish, the sides and 

 rump with a yellow patch. 



Audubon's Warbler, D. Audubonii, Baird, of Western 

 North America, is five and a quarter inches long, the 

 wing nearly three and a quarter inches, the throat yellow, 

 and one large white patch upon the wing. 



The Blackburnian Warbler, D. 

 Blackburnice, Baird, of North Amer- 

 ica east of the Missouri, is five and 

 a half inches long, the wing less 

 than three inches, the back black, 

 throat bright orange, and a patch 



.1 i .-, f , Blackburnian Warbler, 



on the wing and outer tail-feathers D , Blackburnitet Ba ird. 

 white. 



D. In this group the sides and throat are chestnut, 

 and the back streaked. 



The Bay-breasted Warbler, D. castanea, Baird, of North 

 America east of the Missouri, is five inches long, the 

 wing three inches, the crown chestnut, sides of the head 

 black, and belly white. 



