BIRDS OK NOKTII AND MIDDLK AMKRICA. 



188 



Jf. Sides and Hunks very faintly tinged with yt'lluwish olive; axiliars. 

 under wing-coverts, and under tail-coverts very pale sulphur ydluw 

 or nearly wdiite. (Eastern Nortli America, across continent in mid- 

 dle portion; south in winter to northern South America.) 



Vireosylva olivacea (p. 147) 

 (■('. Exposed culnien not more than 10, decidedly shorter than middle toe with- 

 out claw; under i)arts olive-yellowish. ( EasttTu North America, south in 



winter to Chiri(^ui. ) Vireosylva philadelphica (p. 151) 



III). Tenth primary obvious, longer than primary coverts. 



c. I'nder parts of hody dull whitish, the sides and Hanks more olivaceous. 

 (I. Pileum gray, back grayish olive. ( Vircoxiilra (jilra. ) 



e. Paler above. (Eastern United States. ) Vireosylva gilva gilva (p. 153) 



ee. Darker above, especially the pileum. 

 /. Smaller (adult male averaging wing 67.8, tail 50, exposed culmen 9.9; 

 adult female, wing 6(5.4, tail 48.5, exposed culmen, 9.8); sides and 

 flanks more strongly washed with olivaceous. (Western I'nited 

 States, and British Columbia, south in winter to southern ^lexico. ) 



Vireosylva gilva swainsonii (p. 155) 

 ff. liarger (adult male averaging wing 7'A, tail 52.5, expose<l culmen 11.2; 

 adult female, wing 71.7, tail 50.8, exposed culmen 10.8); sides and 

 flanks more faintly tinged with olivaceous. (Mountains of Chihua- 

 hua, northwestern Mexico.) Vireosylvia gilva brewsteri (p. 158) 



(hi. Pileum brown, back olive-bi own. {Mreoxi/lru amanronota.) 



e. Paler above, the jiileum grayish sepia or deep hair brow^n, the back light 

 brownish olive. (Mountains of south(>astern ^lexico. ) 



Vireosylva amauronota amauronota (p. 158) 



A large series from Chapada, Matto Grosso, in the collection of the American Museum 

 <if Natural History, is clearly a connecting series, nearly typical specimens of both 

 forms being represented, though a large majority are nearly typical Hiirl as to colora- 

 tion, but agreeing closely with (igilis in larger size. The same may be said of speci- 

 mens from Bahia also, except that most of the specimens seen by me from the latter 

 locality are clearly T'^ agilis, as above characterized. It is a question, hoAvever, which 

 can only be settled by examination of the type in the Berlin Museum, whether Lich- 

 tenstein's name was ba.sed on a specimen representing the southern or northern type. 

 I have not seen specimens from any other localit\ so small as the two birds (one 

 from the Vermejo River, the other from southern Brazil) brought to the National 

 ^Slusenm by the Page ExjH'dition, their measurements com])aring with those ()f a 

 series from Chapada, as follows: 



Locality. 



M.\I,ES. 



One adult mule from Vermejo River, Paraguay 



One adult male from Corumba, Matto Grosso, Brazil 



Miniiiuiin of each nieasurement in nine adult males from 



Cliai.ada 



Average of uiui' ailult males from ('hai>ada 



FKM.\I,KS. 



One adult female from southeastern Brazil 



Minimum of eaeh measurement in five ndult females 



from Chapada 



Average of live adult female.s from Chapada 



Ex- 

 posed 

 culmen. 



Tarsus. 



11 

 12.3 



11.5 

 12.2 



17 

 17.8 



17 

 17.8 



Middle 

 toe. 



10 

 10.4 



10 

 10.2 



