No. 11. — - The Races of Dendroica vitcllina Cory. 



By Outram Bangs. 



In October, 1886, C. B. Cory described Dendroica vitellina from 

 Grand Cayman Island and in 1904 Nicoll (Bull. B. O. C, 14, p. 95) 

 named as D. crawfordi the form from Little Cayman and later (Ibis, 

 ser. 8, 4, p. 587) noted the same from Cayman Brae. On Swan 

 Island, as might be expected, a different subspecies occurs which is 

 here described. 



These three sedentary island forms are closely related to the migra- 

 tory Prairie Wood Warbler — Dendroica discolor (Vieillot) of North 

 America, from which they differ in being larger with a longer bill, 

 in lacking the chestnut spotting on the back, in all the under tail- 

 coverts being bright yellow, and in having the sides of the breast 

 streaked with dusky olive instead of black (in D. v. vitellina) or 

 almost unstreaked (in D. v. craiofordi and D. v. nelsoni). 



The three races differ as follows: — 



Dendroica vitellina vitellina Cory. 



Dendroica vitellina Cory, Auk, 1886, 3, 497, 501. Grand Cayman 

 Island. 



Characters. — Sides of breast conspicuously streaked with dusky 

 olive; sides of the face, a narrow malar stripe and markings in 

 front and behind the eye, strongly marked with dusky olive, sharply 

 contrasting with the yellow ear-coverts and superciliary; double 

 wing-bands, strongly marked, j^ellow, the upper lemon, the lower 

 citron-yellow; white areas of two outer tail feathers, sharply con- 

 trasted against dusky portions of the feathers ; upper parts warbler- 

 green; lower parts lemon-yellow to pale lemon-chrome. The sexes 

 are practically alike in color in all three races. 



Measurements. — Adult c^, wing, 56 (55-57); tail, 48 (47-50); 

 tarsus, 17.5 (17-18); exposed culmen, 10.83 (10.5-11). Adult 9, 

 wing, 54.5 (53-56); tail, 47.5 (45-50); tarsus, 17.5 (17-18); exposed 

 culmen, 10.5 (10-11). 



Remarks. — Dendroica vitellina vitellina is confined to Grand Cayman 



