1911] Taylor: HijhrUI Warbler. 177 



(1905, pp. 271-282) suggests that a number of the bird species 

 from the "Hypothetical List" of the American Ornithologists' 

 Union Ckccklisf of North American Birds, were probably founded 

 on mutants. Allen (1905, pp. 431-434) criticizes certain weak 

 points in Scott 's conclusions. A review of Scott 's paper by Allen 

 in the Auk (1906, p. 112) sums up the evidence, which points 

 clearly and definitely, in the cases considered, to hybridization 

 rather than to mutation. 



As in those cases, so in the present one of Dendroica, the bulk 

 of the evidence indicates the former rather than the latter 

 hypothesis. Still, the possibility of the bird in hand being an 

 example of extreme germinal variation, with parentage in one or 

 the other of the species {auduhoni and coronata), is not to be 

 left altogether out of consideration. 



LITERATURE CITED. 

 Allen, J. A. 



190.5. The probable origin of certain birds. Science, n.s., vol. 22. pp. 

 431-434. 



1906. Scott "On the probable origin of certain birds." Auk, vol. 

 23, pp. 112-113. 



Dwight, Jonathan, Jr. 



1899. Sequence of plumages illustrated by the myrtle warbler (Den- 

 droica coronata) and the yellow-breasted chat {Icteria 

 virens). Auk, vol. 16. pp. 217-220, pi. 3. 



Ridgway, Robert. 



1902. The birds of North and Middle America. Bulletin U. S. Nat. 

 Mus., no. 50, part II, pp. i-xx, 1-834, pis. 1-22. 



Scott, William E. D. 



1905. On the probable origin of certain birds. Science, n.s., vol. 



22, pp. 271-282. 



Tower, W. L. 



1906. An investigation of evolution in Chrysomelid beetles of the 



genus Leptinotarsa. Carnegie Inst, of Wash., Publ. no. 46, 

 1906, pp. i-x, 1-320, pis. 1-30. text-figs. 1-31. 



Transmitted November 28, 1910. 



