524 NORTH AMERICAN BIRDS. 



p. Lower parts entirely bright yellow, the flanks not very 

 different in color from belly; wing not less than 

 2.40 (?). 

 Adult male otherwise similar to that of G. trichas 

 occidentalism but olive-green of upper parts de- 

 cidedly richer, and white bordering the black 

 mask broader and becoming yellow on sides of 

 neck ; wing 2.40-2.50, tail 2.40-2.55, exposed cul- 

 men .46, tarsus .82-,90. Hah. Eastern and south- 

 ern Mexico (Xalapa, etc.). 



G. melanops Baird, Xalapa Yellow-throat.* 

 e^. Tarsus .90, or more ; exposed culmen .48, or more ; adult male 

 with black mask bordered posteriorly with bright pinm- 

 rose-yellow. 



Adult male: Otherwise similar in color to G. melanops, 

 but still richer olive-green above and more intense 

 yellow beneath. Adult female : Above rich olive- 

 green, slightly tinged with reddish brown on crown ; 

 beneath rich gamboge-yellow (somewhat tinged with 

 saffron antei"iorly), the belly more whitish and flanks 

 inclining to grayish brown ; length (skins) about 5.50- 

 6.00, wing 2.30-2.55 (2.43), tail 2.40-2.75 (2.59), ex- 

 posed culmen .48-.51 (.49), tarsus .90-.95 (.91). Hab. 

 Southern portion of Lower California. 



682, G. beldingi Eidgw. Belding's Yellow-throat. 

 d^. Exposed culmen .60, or more ; bill stout, compressed, with the 

 culmen decidedly curved, 

 e\ Black mask of adult males bordered behind by light ash-gray 

 (sometimes tinged with yellowish from eye downwards) ; 

 upper parts dull olive-green ; lower parts rather light gam- 

 boge-yellow, sometimes inclining to buffy whitish on anal 

 region and flanks. Adult females with forehead dull brown- 

 ish or grajdsh like crown, and posterior lower parts (except 

 under tail-coverts) dull whitish. 

 p. Bill more slender and tarsus longer. Adult male with 

 hinder border to black mask light ash throughout, the 

 occiput darker ashy ; wing 2.30-2.50 (2.41), tail 2.30- 

 2.50 (2.41), exposed culmen .60-.65 (.62), tarsus .90- 

 .92 (.90). Hab. Island of New Providence, Bahamas. 

 G. rostrata Bryant, Nassau Yellow-throat.' 



Wing 1.95-2.35 (2.15), tail 1.85-2.35 (2.07), exposed culmen .38-.50 (.42), tarsus .73-.80 (.78). These measure- 

 ments show that, while there is a very great amount of individual variation, the average is intermediate 

 between that of the extreme eastern and western series, respectively. 



* Geothlypia melanops Baird, Review, i, April, 1865, 222, 



* Geothlypis rostrata Bryant, Proc. Bost. Soc. N. H. xi, 1867, 67. 



