Hypothetical List 



The following list contains those Warblers whose specific validity, 

 or whose occurrence in North America has not been definitely estab- 

 lished. 



Cincinnati "Warbler 



HELMINTHOPHILA CINCINNATIENSIS (Langdon) 



The single specimen known is generally considered to be a hybrid 

 between Helminthophila pinus and Oporornis formosa. See Langdon 

 Journ. Cine. Soc. Nat. Hist, III, 1880, 119, pi. 6; Bull. Nutt. Orn. 

 Qub V, 1880, 208, pi. 4; Ridgway, Ibid., 237. 



BREWSTER'S Warbler 



HELMINTHOPHILA LEUCOBRONCHIALIS (Brewst.) 



Apparently a color phase of Helminthophila pinus. See, however, 

 page 73, where the bird's status is discussed at length. 



LAWRENCE'S Warbler 



HELMINTHOPHILA LAWRENCEI (Herrick) 



Doubtless a hybrid between H. pinus and H. chrysoptera. See 

 page 72 for a discussion of its status. 



Carbonated Warbler 



DENDROICA CARBONATA (Aud.) 



This bird is known to us only from Audubon's plate and descrip- 

 tion based on two specimens taken by him at Henderson, Kentucky, 

 in May, 181 1 (Orn. Biog., i, 308 pi. 60). 



Small-headed Warbler 



WILSONIA MICROCEPHALA !Ridgw.) 



This bird is known to us only from the descriptions and figures 

 of Wilson and Audubon. It was described by Wilson under the name 

 Muscicapa minuta. (Am. Orn. VI, 1812, 62), but in 1838 was referred 

 by Bonaparte to the genus Wilsonia. In 1885 Ridgway substituted 

 the name microcephala for that of minuta, the latter proving to be 

 preoccupied. 



