478 NORTH AMERICAN BIRDS. 
California (north through Sacramento Valley), Lower 
California, and Arizona. 
633a. V. pusillus Cours. Least Vireo, 
é. Middle wing-coverts distinctly tipped with white, like greater 
coverts; bill from nostril more than .30. 
Colors as in V. pusillus, except as described above; wing 
2.20-2.30, tail 1.90-2.00, bill from nostril .33, exposed 
culmen .48, tarsus .78. Hab. West coast of Nicaragua 
and Costa Rica. 
V. pallens Satv. Pale Vireo.? 
d@. Wing 2.50, or more, tail 2.40, or more. 
Colors as in V. pusillus, but lores entirery grayish white, 
and band across tips of greater wing-coverts less distinct 
(sometimes obsolete), the middle coverts never tipped with 
white; length about 5.60-5.75, wing 2.50-2.60, tail 2.40- 
2.55, tarsus .70-.78. Nest in thorny bushes. Eggs .73 x 
56. Hab. Southern California, Arizona, New Mexico, 
western Texas, and northwestern Mexico. 
634. V. vicinior Couzs. Gray Vireo. 
c’. Lower parts yellow. 
d', Above dull grayish olive, the wings with two very narrow whitisa 
or pale yellowish bands; lores, orbital ring, and lower parts 
pale yellow, becoming distinctly olive-gray on sides; wing 2.15- 
2.30, tail 2.20-2.30, tarsus .80-.90. Hab. Cuba. 
V. gundlachi Lema. Cuban Vireo. 
@. Above bright yellowish olive-green; wings without trace of light 
bands; superciliary stripe and lower parts bright yellow, the 
sides tinged with olive; length about 5.50, wing 2.55-2.65, tail 
2.40-2.60. Hab. Southwestern Mexico (Oaxaca to Tres Marias). 
V. hypochryseus Sci. Yellow Vireo.t 
Gznus HYLOPHILUS Temmincz (Page 469, pl. CXV., fig. 4.) 
Species. 
Common CHaracters.—Above mostly or partly plain olive or olive-green, the 
head more or less different in color from other portions; beneath plain light olive 
or olive-greenish, the throat (in one species whole of median lower parts) dull 
whitish. 
1 Unquestionably a good species, which should stand as V. pusillus Cours. In a series of 22 specimens at 
this moment before me, including 1] from Arizona (embracing several so-called “intermediate” examples), 
there is not the slightest suggestion of intergradation with V. bedlit. : 
2 Vireo pallens Sarv., P. Z. 8. 1863, 188. 
3 Vireo gundlachi Lumpern, Aves de la Cuba, 1850, 29, pl. 5, fig. 1. 
* Vireo hypochryseus Scr.., P. Z. 8. 1862, 390, pl. 46. 
5 Hylophilue Tema., PJ. Col. iii, Livr. 29, 1823, text, and pl. 173, ig. 1. Type, H. thoracicus Tex. 
