524 NORTH AMERICAN BIRDS. 
f*. 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 
occidentalis, 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. Hab. Eastern and south- 
ern Mexico (Xalapa, etc.). 
G. melanops Barrp. Xalapa Yellow-throat.! 
e. Tarsus .90, or more; exposed culmen .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 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). Had. 
Southern portion of Lower California. 
682. G. beldingi Rinaw. Belding’s Yellow-throat. 
@, Hixposed 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 grayish like crown, and posterior lower parts (except 
under tail-coverts) dull whitish. 
f*. 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 » very great amount of individual variation, the average is intermediate 
between that of the extreme eastern and western series, respectively. 
1 Geothlypis melanops Baird, Review, i. April, 1865, 222. 
2 Geothlypis rostrata Bryant, Proc. Bost. Soc. N. H. xi. 1867, 67. 
