Nov., l‘M,i 
So:M]i 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 jieak did we find Sierra Grouse more 
abundant than about Lake Lucile, elevation 8200 feet. About Phillips’ on June 24, 
young-of-the-year Pileolated Warblers were seen. 
On June 26, after we had again returned to Bijou, 1 secured on the west 
side of Lake A’alley a very dark plumaged Western Red-tailed Pfawk. The skin 
was sent to Mr. Joseph Grinnell at Berkeley, who writes as follows concerning 
it: "The bird is an immature female of Biitco borealis caliinis, and is catalogued 
as no. 13991 of the collection of the California Aluseum 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 vSierra Junco, on store of Pyramid Peak above Forni’s, 
Etdorado County, Catifornia 
In Cold Creek Canyon on June 28 1 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 structure 
made of sticks and twigs, next to which was placed a generous quantity of liark 
stri])s and lastly an inner lining of fine grasses. After reaching the 
ne.st the parent birds soon put in their a]ipearance and showed great solicitude, 
fluttering at times almost within reach of my hand. 
Returning, near the Sierra House, 1 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 ]iarts pure white and iris 
light reddish. Further on, near Bijou, 1 came upon a chipmunk in the act of de- 
stroying a nest of eggs of the PIousc Finch. June 30 and July t were spent in 
