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Nov., 1913 SOME FURTHER NOTES ON SIERRAN FIELD-WORK 201 noted in Glen Alpine Gorge with the large and uncommon complement of five eggs. At no place on either trip to the peak did we find Sierra Grouse more abundant than about Lake Lucile, elevation 82o0 feet. About Phillips' on June 24, young-of-the-year Pileolated Warblers were seen. On June 26, after we had again returned to Bijou, I secured on the west side of Lake Valley a very dark plumaged Western Red-tailed Hawk. The skin was sent to Mr. Joseph Grinnell at Berkeley, who writes as follows concerning ,-'t: "The bird is an immature female of Buteo borealis calurus, and is catalogued as no. ?399? of the collection of the California Museum of Vertebrate Zoology. In its dark phase of plumage it resembles examples from elsewhere in California in similar stage. It does not seem possible to correlate this depth of coloration in certain individuals with altitude or with any other circumstance I can think of." Fig. 55. NEST OF SIERRA JUNCO, ON SLOPE OF PYRAMID PEAK ABOVE FORNI'S, ELDORADO COUNTY, CALIFORNIA In Cold Creek Canyon on June 28 I found my first occupied nest of that elusive nester, the Thick-billed Sparrow. It held four large young and was placed a foot up in thorny deer brush bordering a cattle path. It was a bulky structm'c made of sticks and twigs, next to which was placed a generous quantity of bare strips and lastly an inner lining of fine grasses. After reaching the nest the parent birds soon put in their appearance and showed great solicitude, fluttering at times almost within reach of my hand. Returning, near the Sierra House, I found a nest of the Mountain Song Sparrow in a meadow at the foot of small willows, with three young, one of which was a partial albino, it having the entire under parts pure white and iris light reddish. Further on, near Bijou, I came upon a chipmunk in the act of de- stroying a nest of eggs of the House Finch. June 3 and July ? were spent in