148 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
This species was discovered by Mr. Belding in 1883, inthe mountains south 
of La Paz where it “ was very common .. . above 3,000 feet altitude.” Mr. 
Frazar found it in considerable numbers of the Sierra de la Laguna in May 
and early June, but so few were observed here in December as to lead him to 
conclude that many individuals must descend to lower levels to pass the 
winter. They cannot, however, go very far down, for none were met with at 
San José del Rancho, and but one (on April 13) at Triunfo. On the Sierras 
they inhabit the pine and oak woods, and, like most Juncos, are tame and 
familiar. They often came into a shed where Mr. Frazar prepared his speci- 
mens, and hopped about his feet, under the table, or pecked at the dried venison 
suspended from the roof. No nests were found, but late in May a bird was 
seen collecting building material. 
Baird’s Junco appears to be confined to the extreme southern end of the 
Peninsula, never having been observed so far north, even, as La Paz. It is, 
therefore, one of the most characteristic birds of the Cape fauna. 
Amphispiza bilineata deserticola Rew. 
DESERT SPARROW. 
Amphispiza bilineata (not Emberiza bilineata Casstx) Betpine, Proc. U.S. Nat. 
Mus., V. 1883, 540 (Cape Region). Satvin and Gopmay, Biol. Centr.-Amer., 
Aves, I. 1886, 367, 868, part (descr. female from La Paz). Bryant, Proc. 
Calif. Acad. Sci., 2d ser., II. 1889, 302 (Cape Region). 
Mr. Frazar found the Desert Sparrow at Triunfo, San José del Cabo, La Paz, 
and Carmen Island. It was commonest at La Paz, and least numerous at San 
José del Cabo. Neither his notes nor the dates at which his specimens were 
collected afford any evidence that it breeds in the Cape Region, but Mr. Bryant 
has found nests on Santa Margarita and Magdalena Islands where it was ‘‘ the 
most common and generally distributed species.” It appears to range over 
the entire Peninsula, but in California is practically confined to the region east 
of the Sierras. I have winter specimens taken at Guaymas, Cumpas, and Ba- 
cuachi in western Mexico and a large series collected near the city of Chihua- 
huainautumn. These Mexican specimens do not differ, so far as I can discover, 
from those which Mr. Frazar obtained in Lower California, although the Guaymas 
bird should represent Mr. Nelson’s A. b. pacifica,) the type locality of which 
is Alamos, Sonora. 
Aimophila ruficeps sororia Rmew. 
LAGUNA SPARROW. 
Peucaea ruficeps Cooper, Orn. Cal., 1870, 218. part. Covers, Check List, 1873, 35, 
no. 171, part; 2d ed., 1882, 55, no. 255, part. Ripeway, Nom. N. Amer. 
1 Auk, XVII. 1900, 267. 
