BIRDS OP NORTH AND MIDDLE AMERICA. 131 



KEY TO THE SPECIES AND SUBSPECIES OF VIREOSYLVA. 



a. Back olive, olive-green, or olive-gray. (Adults.) 

 b. Tenth primary obsolete. <» 

 c. Exposed culmen 11.5 or more, longer than middle toe without claw; under 

 parts white or pale grayish medially. 

 d. Pileum grayish brown, or brownish gray, concolor with back, 

 e. Under parts grayish olive or olive-grayish laterally, becoming dull gray- 

 ish or olivaceous white medially; upper parts darker, especially the 

 pileum. ( Vireosyha magister. ) 

 f. Coloration more decidedly, or more brownish, olive; slightly larger, 

 especially the bill (exposed culmen averaging 16.5 in adult male). 

 (Coast of Honduras and British Honduras.) 



Vireosylva magister magister (p. 134) 

 ff. Coloration grayer; slightly smaller, especially the bill (exposed culmen - 

 averaging 15.7 in adult male) . (Coast of Yucatan, including islands 



of Cozumel and Mugeres. ) Vireosylva magister cinerea (p. 136) 



ee. Under parts dull white, the sides and flanks tinged with yellowish olive; 

 upper parts paler, especially the pileum. (Island of Grand Cayman, 



near Cuba.) Vireosylva caymanensis (p. 136) 



dd. Pileum gray, in more or less marked contrast with olive-green of back, etc. 



e. A dusky submalar streak. ( Vireosylva calidris. ) 



/. Smaller, especially the bill (exposed culmen not more than 18, usually 



much less, wing averaging less than 83). 



g. Pileum dull brownish gray or grayish brown, without distinct, if any, 



lateral line of dusky; superciliary stripe and cheeks dull grayish 



buff or pale Isabella color. (Islands of Jamaica, Haiti, Porto Rico, 



St. Thomas and St. Croix, Greater Antilles; Sombrero and Saba, 



Lesser Antilles; Trinidad.) Vireosylva calidris calidris (p. 137) 



gg. Pileum purer or clearer gray, with a more or less distinct lateral 

 line of dusky; superciUary stripe and cheeks pale gray or grayish 

 white. 

 h. Dusky lateral line of pileum more distinct; superciliary stripe pale 

 gray, becoming grayish white anteriorly; bill larger (exposed 

 culmen of adult male 15.5-17, averaging 16.2). (Islands of St. 

 Eustatius, Antigua, Montserrat, Guadeloupe, Dominica, Mar- 

 tinique, Santa Lucia, St. Vincent, Grenada, and Barbados, 



Lesser Antilles. ) Vireosylva calidris barbadenais (p. 140) 



hh. Dusky lateral line of pileum less distinct, sometimes obsolete; 

 superciliary stripe pale brownish gray; bill smaller (exposed 

 culmen of adult male 14-15.5, averaging 14.9). (Bahamas, 

 Cuba and southern Florida. ) 



Vireosylva calidris barbatnla (p. 141) 

 ff. Larger, especially the bill f exposed culmen 18 or more, wing 84-87). 

 fir. Olive-green above; sides and flanks yellowish oUve; under tail- 

 coverts pale yellow. (Island of Old Providence, Caribbean Sea. ) 



Vireosylva calidris graudior (p. 143) 



gg. Grayish olive above; sides, flanks, and under tail-coverts whitish, 



I like rest of under parts. (Island of St. Andrews, Caribbean Sea. ) 



, < Vireosylva calidris canesceus (p. 143) 



ee. No dusky submalar streak (the throat entirely white, or grayish white.) 



/. Sides and flanks olive-yellow, or strongly washed with that color; 



axillars, under wing-coverts, and under tail-coverts sulphur yellow. 



ffl Said to be sometimes visible in V. olivacea, but I have never seen such a specimen. 



