82 PACIFIC COAST AVIFAUNA No. 11 
Cooper Orn. .Club., 1, 1899, p. 53), and upper Salinas Valley, San Luis Obispo 
County. (Thompson, Condor, u, 1900, p. 54). Of wide, though sporadic oceur- 
rence in winter in timbered areas everywhere west of the Sierran divide, and 
south through the San Diegan district, at least to Witch Creek (Marsden, Con- 
dor, 1x, 1907, p. 27). Recorded from but one locality anywhere southeast of the 
Sierras: Yermo, Mohave Desert, October (Lamb, Condor, xiv, 1912, p. 36). The 
species is erratic in its distributional behavior both summer and winter, and is 
quite likely to put in an appearance anywhere irrespective of climatic conditions. 
247 (411) Centurus uropygialis uropygialis Baird 
Giua WOODPECKER 
Synonym—WMelanerpes uropygialis. 
Status—Common resident along the valley of the Colorado River, from the 
Nevada line to the Mexican line (many records) ; closely adherent to the willow- 
cottonwood association of the river bottom, and to the giant cactus belt, of lim- 
ited extent a few miles above Potholes. 
248 (412a, part) Colaptes auratus borealis Ridgway 
BoreaAu FLICKER 
Synonyms—Colaptes auratus, part; Colaptes auratus luteus; Yellow-shafted 
Flicker, part; Northern Flicker. 
Status—Rare winter visitant. Although recorded from many widely scat- 
tered localities, the southernmost of which is Palm Springs, Riverside County 
(—‘‘Warm Springs, San Diego County’’: J. A. Allen, Bull. Amer. Mus. Nat. 
Hist., 1v, 1892, p. 21), it is quite probable that many of these are really based 
upon aberrantly colored examples of C. c. collaris. The latter, like the California 
Linnet, appears to be subject to recessive coloration, whereby in certain individ- 
uals reds are replaced by yellow. Conspicuously yellow-shafted flickers should 
not, therefore, because of this feature alone, be referred to C. a. borealis. I 
have personally examined the following apparently ‘‘pure-blood’’ specimens of 
borealis: 8, no. 6056, December 18, 1893; 2, no. 6057, January 14, 1895, both 
from San Geronimo, Marin County, and contained in the Mailliard collection; ¢, 
no. 1853, Swarth collection, Los Angeles, February 20, 1901. 
249 (413) Colaptes cafer collaris Vigors 
RED-SHAFTED FLICKER 
Synonyms—Colaptes collaris; Colaptes mexicanus; Colaptes mexicanoides ; 
Colaptes ayresw; Colaptes cafer; Colaptes cafer mexicanus; Colaptes cafer 
hybridus ; Colaptes auratus mexicanus ; Colaptes auratus, part; Colaptes auratus 
var. hybridus; Yellow-shafted Flicker, part; Hybrid Flicker. 
Status—Common resident of Upper Sonoran and Transition zones almost 
throughout the state; breeds also locally in the Canadian zone; winters in suita- 
ble portions of the Lower Sonoran deserts as well as abundantly in Upper Sono- 
ran and Transition. Flickers of the extreme northern humid coast belt are inter- 
mediate towards saturatior, so far so as to be best referred to that form in cer- 
