On 22 May 1976 Remsen heard a singing Rufous-crowned Sparrow (Aimophila ruficeps) at 6000 ft (1825 m) in Live Oak Canyon, New York Mountains, northeastern San Bernardino County, California, about 19 km from the Nevada border. Attempts to see the bird failed. On 28 and 29 July 1976 Remsen returned to the area and again located a Rufous-crowned Sparrow, singing from the same slope as in the May observation. This time the bird was seen and studied in detail (McCaskie 1976). In late May 1977 at least three singing birds were found in the Keystone Canyon–Live Oak Canyon area of the New York Mountains by Stephen F. and Karen L. Bailey, Cardiff and Remsen. The authors found one still present on 20 June 1977, when Cardiff succeeded in obtaining a specimen (male with enlarged testes; San Bernardino County Museum 30001). It was subsequently identified as A. r. scottii by Ned K. Johnson and Remsen by comparison with the large series of North American races of this sparrow at the Museum of Vertebrate Zoology. The dates of occurrence and consistent presence of singing birds at a single locality indicate local nesting, although no direct evidence was obtained.