624 NORTH AMERICAN BIRDS. 



/'. Lower parts entirely bright j-ollow, the flanks not verj- 

 different in color from bcllj- ; wing nut less than 

 2.40 (?). 



Adult male otherwise similar to that of G. trichas 

 occidental is, 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 eul- 

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

 ern Mexico (Xalapa, etc.). 



G. melanops B.'iiuD. Xalapa Yellow-throat.' 

 e'. Tarsus .90, or more ; exposed culmcn .48, or more ; adult male 

 with black mask bordered posteriorly with bright prim- 

 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 anteriorly), the belly more Avhitish and flanks 

 inclining to graj'ish 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 (Ad), tarsus .90-.95 (.91). Hab. 

 Southern portion of Lower California. 



(!82. G. beldingi Eidgw. Belding's Yellow-throat. 

 d'. Exposed culmcn .GO, 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 grayish like crown, and posterior lower parts (except 

 under tail-coverts) dull whitish. 

 /'. 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 culmcn .C0-.G5 (.62), tarsus .90- 

 .92 (.90). ]Ial>. Island of New Providence. Tialuuiias. 

 G. rostrata Buyant. Nassau Yellow-throat.' 



Wing 1.95-2.35 (2.15), tail 1.85-2..'!5 (2.07), exposed oulmcn .,18-.50 (.42), tarsus .7.3-.80 (.78). These measure- 

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

 between that of the extreme castom and western sorien, resjicctively. 



' Grotlih/ph meliinop, Baird, Hcview. I. April, 186'), 222. 



' Geotklypii rotlrata BiiYAST, Proc. Bost. Soo. N. II. xi. 18(57, 67. 



