664 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Trichas pcrsonatus^ Swainson, Philos. Mag., new ser., i, 1827, 433, part; Zool. 

 Journ., iii, 1827, 167; Isis, 1830, 1153; 1834, 785; Classif. Birds, ii, 1837, 247.— 

 Jardine, ed. Wilson's Am. Orn., i, 1832,88, 303, part. 



The following references I am unable, in the absence of specimens 

 from the localities cited, to properly allocate: 



Geothlypis trichas SundevaLl, Ofv. k. Vet.-Ak. Forh. Stockh., xxvi, 1870, 596 

 (Porto Rico).— GuNDLACH, Anal. Soc. Esp. Hist. Nat., vii, 1878, 187 (Porto 

 Rico).— Cory, Bull. Nutt. Orn. Club, vi, 1881, 151 (Haiti); Birds Haiti and 

 San Dom., 1885, 36; Auk, vi, 1889, 31 (Little Cayman); viii, 1891, 352 

 (Anguilla and Gay Sal, Bahamas, May); Gat. W. I. Birds, 1892, 119, part 

 (Great Bahama, Biminis, Berry, Andros, Great Inagua, Cay Sal and 

 Anguilla islands, Bahamas; Isle of Pines; Grand Cayman; Haiti; Porto 

 Rico).— Northrop, Auk, viii, 1891, 69 (Andros I., Bahamas). — Cherrie, 

 Contr. Orn. San Dom., 1896, 12 (Santo Domingo, Fel). 2 to May 8). 



GEOTHLYPIS TRICHAS BRACHIDACTYLA (Swainson). 

 NORTHERN YELLOW-THROAT. 



Similar to G. t. trichas^ but averag-ing- larger; adult male with under 

 parts more extensively yellow (often almost wholly yellow) and upper 

 parts more decidedl}^ olive-green; adult female usually with the j'^ellow 

 of under parts brighter and more extended than that of G. t. trichas"^. 



Adult maJc.—l^Qngih (skins), 105-133 (112.1); wing, 51.5-59 (55.1); 

 tail, 41-56 (49.2); exposed culmen, 10-12 (11.4); tarsus, 18.5-22(20.5); 

 middle toe, 12-14.5 (13.7)^ 



xidult female.— l^Qngih (skins), 105-121 (111.3); wing, 48-54.5 (51.7); 

 tail, 45-50 (46.8); exposed culmen, 10-11.5 (10.7); tarsus, 19-21.5 

 (19.9); middle toe, 12-14 (12.8)*. 



' Not named as a new species, hut a new specific name given to the old species, 

 ))ecause the name Trichas was used for a su{)posedly new genus. 



'^The adult females of both forms vary greatly in the amount or extent of yellow 

 on the under parts. 



■^ Sixty-five specimens. 



* Twenty-six specimens. 



Specimens from different localities or geographic areas average respectively as 

 follows: 



