176 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



Vireo huttoni Stephens! Bkewst. 



Stephens's Vireo. 



Vireo huttoni stephensi Belding, Proc. U. S. Nat. Mus., VI. 1883, 347 (Victoria 

 Mts.). Bryant, Proc. Calif. Acad. Sci., 2d ser., IL 18»9, 307 (Victoria Mts.). 



Lower California specimens of Stephens's Vireo have larger bills than those 

 from Arizona, but I can discover no other differences. A young bird in 

 Juvenal plumage (No. 10,248, Santa Rita Mountains, Arizona, July 9, 1884, 

 F. Stephens) differs from the adult in having the outer edges of the wing quills 

 and tail feathers olive green ; the upper tail coverts tinged with olive ; the 

 back, nape, and crown suffused with drab ; the wing bands yellowish; and the 

 under parts lighter, the middle of the abdomen and breast being nearly pure 



white. 



Autumnal birds in winter plumage, of which the Lower California collection 

 contains several representatives, show a tinge of olive above and more or less 

 brownish beneath, while the outer edges of the wings and tail are greenish 

 olive, as with the young in juvenal plumage. The deepest colored autumnal 

 specimens, however, are much paler and grayer than any of my examples of 



V. huttoni. 



Mr. Belding, who was the first to detect Stephens's Vireo in Lower California, 

 trives it in his list of mountain birds as "common above 3,000 feet altitude," 

 but " not observed below tliis." Mr. Frazar found it numerous among the 

 pines on the Sierra de la Laguna in :\I-iy and early June, but none of the 

 specimens killed there showed any signs of breeding. He also met with 

 it at San Jose del Rancho in July, although not in any numbers. During 

 his second visit to La Laguna, the last week of November, two birds were 

 shot and several others seen on the very summit of this mountain, and a few 

 days later (on December 2) a single specimen was taken at Triunfo, indicating 

 that at least a few individuals winter in the Cape Region, to the northward of 

 w^hich, on the Peninsula, this Vireo has not yet been noted. It inhabits 

 southern Arizona, and is a common bird in many parts of western Mexico. 



Vireo pusillus Coues. 



Least Vireo. 



Vireo pusillus Belding, Proc. U. S. Nat. Mus , V. 1883, 5.37 (Cape Region). Bated, 

 Brewer, and Ridgwat, Hist. N. Arner. Birds, I. 1874, 391-393, pi. 17, fig. 

 14 (descr. : Cape St. Lucas). 



Vireo hellii pusillus Bryant, Proc. Calif. Acad. Sci., 2d ser., II. 1889, 308 (Cape 

 Region). 

 Mr. Grinnell has recently separated the Least Vireo of California from that 



of "Arizona and southern Lower California," under the name Vireo pusillus 



