46 BULLETIN 195, UNITED STATES NATIONAL MUSEUM 



The eggs of this subspecies are indistinguishable from those of the 

 following form. The measurements of 40 eggs of the present race 

 average 15.4 by 12.1 millimeters; the eggs showing the four extremes 

 measure 16.3 by 12.8, 14.5 by 12.3, and 14.7 by 11.2 millimeters. 



DISTRIBUTION 



Range. — Southern British Columbia to southern Mexico. 



The pygmy nuthatch breeds north to southern British Columbia 

 (Cawston, Penticton, and Newgate). East to southern British Co- 

 lumbia (Newgate) ; western Montana (probably Belton and the Bear- 

 tooth Mountains) ; Wyoming (near Laramie) ; Colorado (Estes Park, 

 mountains west of Boulder, Golden, and Fort Garland) ; possibly 

 northeastern Oklahoma (Kenton) ; New Mexico (Sangre de Cristo, 

 Capitan, and Sacramento Mountains) ; southwestern Texas (Guada- 

 lupe Mountains) ; and Veracruz (Las Vigas). South to Veracruz 

 (Las Vigas) ; Puebla (Mount Orizaba and Rio Frio) ; Morelos (Huit- 

 zilac) ; and Michoacan (Mount Tancitaro). West to Michoacan 

 (Mount Tancitaro) ; Jalisco (San Sabastian) ; Baja California 

 (Sierra San Pedro Martir and Laguna Hansen) ; California (Mount 

 Pinos, Monterey, Point Reyes, and Inglenook) ; Oregon (Pinehurst 

 and Warm Springs Reservation) ; Washington (Seattle and Mount 

 Baker); and British Columbia (Cawston). 



The pygmy nuthatch is not migratory, but it does wander about 

 some in winter, at which time it has reached western Nebraska. 



The distribution as given is for the entire species, which has been 

 divided into four subspecies or geographic races within our limits. 

 The pygmy nuthatch {S. p. pygmaea) occurs in the coast region of 

 California from Mendocino County south to San Luis Obispo County. 

 The white-naped nuthatch {S. p. leuconucha) breeds from Riverside 

 and San Diego Counties, Calif., south through the San Pedro Martir 

 Mountains, Baja California. The Nevada nuthatch {S. p. canescens) 

 occurs in the Charleston and Sheep Mountains in southern Nevada. 

 The black-eared nuthatch {S. p. melanotis) occupies the Rocky Moun- 

 tain region from southern British Columbia southward to New Mexico 

 and Arizona, and possibly Sonora, and the Sierra Nevada in 

 California. 



Egg dates. — Arizona : 9 records, May 7 to June 6. 



California : 89 records, April 17 to June 27 ; 45 records. May 16 to 

 June 3, indicating the height of the season. 



Colorado: 22 records, May 13 to June 19; 11 records, May 22 to 

 June 12. 



Oregon : 17 records, May 3 to June 21. 



