478 NORTH AMERICAN BIRDS. 



California (north through Sacramento Valley), Lower 

 , California, and Arizona. 



633a. V. bellii pusillus (Coues). Least Vireo. 1 

 e'. 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. Sab. West coast of Nicaragua 

 and Costa Eica. 



V. pallens Salv. Pale Vireo. 2 

 d 2 . Wing 2.50, or more, tail 2.40, or more. 



Colors as in V. pusillus, but lores entirely 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. Sab. Southern California, Arizona, New Mexico, 

 western Texas, and northwestern Mexico. 



634. V. vicinior Coues. Gray Vireo. 

 c'. Lower parts yellow. 



d 1 . Above dull grayish olive, the wings with two very narrow whitisn 

 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. Sab. Cuba. 



V. gundlachi Lemb. Cuban Vireo. 



d 2 . 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. Sab. Southwestern Mexico (Oaxaca to Tres Marias). 



V. hypochryseus Set. Yellow Vireo. 4 



Genus HYLOPHILUS Temminck. 5 (Page 469, pi. 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 Cot/es. In a series of 22 specimens at 

 this moment before me, including 11 from Arizona (embracing several so-called "intermediate" examples), 

 there is not the slightest suggestion of intergradation with V. bellii. 



2 Vireo pallens Salv., P. Z. S. 1863, 188. 



" Vireo gundlachi Lembeye, Aves de la Cuba, 1850, 29, pi. 5, fig. 1. 



• Vireo hypochryseus Scl., P. Z. S. 1862, 390, pi. 46. 



6 Bylophilus Temm., PI. Col. iii. Livr. 29, 1823, text, and pi. 173, fig. 1. Type, B. thoracicus Temm. 



