226 BULLETIN UNITED STATES GEOLOGICAL SURVEY. [Yol.YI. 



20th of March, frequenting the grassy spots among low bushes, and 

 thinks they remain in the Colorado Yalley during the summer. Dr. 

 Coues also found it in small numbers at Fort Whipple, where they are 

 said to breed. 



Junco oregomis (Towns.) Scl. — Oregon Snowbird. 



Winters in the western portions of IS'evada, and has also been noted 

 in the Colorado Yalley during the same season. According to Dr. Coues, 

 is an abundant winter resident in Arizona, arriving at Fort Whipijle early 

 in October, where they remain until the middle of April. Those remain- 

 ing in Nevada during the mild winters retire to the Sierra I^evada 

 Mountains upon the first approach of moderating weather in spring. 



AmpMspiza hilineata (Cass.) Coues. — Black-throated Sparrow. 



Like A. nevadensis this species also occurs throughout the sage-brush 

 regions in the northern and middle portions of the State, but in the 

 southern regions was found in the elevated deserts, between Spring 

 Mountain and the Colorado, containing an abundant growth of Alga- 

 rohia and Yucca baccata. According to Dr. Cooper they descend to the 

 hills near the Colorado during the winter. 



AmpMspiza belli nevadensis Eidgw. — Sagebrush Sparrow. 



According to Mr. Ridgway, the distribution of this species seems to 

 be strictly governed by that of the sage-brush (Artemisia), since it is 

 present in nearly all the districts abounding in this class of vegetation, 

 while it is apparently wanting in localities of any other character. This 

 species probably occurs in the Colorado Yalley as far north as Fort 

 Mojave, it having been observed farther south, and on the Gila in Ari- 

 zona. 



Melospiza fasciata fallax Baird. — Mountain Song Sparrow. 



Rather common, though more particularly so in the eastern and south- 

 eastern portions of the State. Mr. Ridgway's collection seems to have 

 been obtained chiefly in Utah, though the Humboldt Yalley furnished 

 some specimens. 



Melospiza fasciata heermanni Baird. — Heermann's Song Sparrow. 



Appears to be more particularly distributed along the extreme border 

 near the Sierras, while in the eastern portions of the State it appears 

 to be less common; here fallax occurs and seems to replace it to some 

 extent. Occurs also in the southern jjart of Nevada, opposite Fort 

 Mojave, and westward toward the Pacific coast, where Dr. Cooper 

 found it. 



Melospiza fasciata guttata (Nutt.) Baird. — Rusty Song Sparrow. 



Individuals of this variety were met with in the West Humboldt 

 Mountains by Mr. Ridgway. 



The remaining varieties of the ordinary type have been arranged by 



