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 



VERMIVORA CINCINNATIENSIS (Langdon) 



The single specimen known is generally considered to be a hybrid 

 between Vermivora pinus and Oporornis formosus. 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 



VERMIVORA LEUCOBRONCHIALIS (Brewst.) 



Apparently a hybrid of V. pinus and V. chrysoptera. See, how- 

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



LAWRENCE'S Warbler 



VERMIVORA LAWRENCEI (Herrick) 



Doubtless a hybrid between V. pinus an4 V. 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. 



