THE CONDOR 
A Magazine of Western Ornithology 
Published Bi-Monthly by the Cooper Ornithological Club 
Entered as second-class matter November 29, 1919, at the post-office at Berkeley, California, under Act 
‘ of Congress of March 3, 1879. Acceptance for mailing at special rate of postage provided for 
; in Section 1103, Act of October 3,1917. Authorized January 5, 1921. . 
Issued from the Office of THE CoNDOR, Museum of Vertebrate Zoology, Berkeley, California 
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Museum of Vertebrate Zoology, University of California, Berkeley, California. 
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within thirty days of date of issue. 
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Manager. 
For the Purchase of Back Volumes of The Condor or of the Pacific Coast Avifauna series, apply to the 
Business Manager. 
W:. LEE CHAMBERS, Business Manager, Eagle Rock, Los Angeles County, California. 
Issued June 3, 1921 
CONTENTS 
Notes on the Nesting of the Yosemite Fox Sparrow, Calliope Hummingbird 
and Western Wood Pewee at Lake Tahoe, California (with one photo) 
ge OA eA NAPE GER Beans acca, CANCUN SR OURS tia RD SES eS fs John W. Mailliard 73 
Nesting of the Ss whet: Fox Sparrow (with three photos).Wright M. Pierce 80 
Weights and Plumage of Ducks in the Rio Grande Valley........ Aldo Leopold 85 
A Bird Census at Prescott, Walla Walla County, Washington (with one 
AMD TOEO ei Fees eee ee ee i ONS i 7 TEASE SS aa Lee R. Dice 87 
Additional Notes on the Water and Shore Birds of Netarts Bay, Oregon 
Ei with-two photos by, Of 3. Muriey. 2) ee ee Stanley G. Jewett 91 
New Bird Records for North America, with Notes on the Pribilof Island 
ng] W'S) Bg i ss lade gy AS Tpke se Paid NE 1k Joseph Mailliard and G. Dallas Hanna 93 
FROM FIELD AND STUDY 
Notes on the Hypothetical List of California Birds..........J. H. Fleming 95 
: California Pigmy Owl from Cucamonga Canyon, Southern California... 
Ee an WS anced. lara Sea ays ok PI OLAS UT ge ae Ra CA Ae Da Wright M. Pierce 96 
_An Addition to the Oregon List of Birds................0.... Ira N. Gabrielson 96 
Early Spring Notes on ens of Coronado Islands, Mexico .................-.---- 
Teepe nee Ok ETE RRC tally casei a Se Ci Gat Mek Ma Mb SARs, Li Frank Stephens 96 
Does the Wren-tit Sing a Scale? fee ion er Ve gfe ai eR Se Loye Miller, 97 
Southern California Screech Owl in Western Orange County .................... 
PR ee PE AR DING AL RU MN LEY ALANA CBRL es NE UU ot John McB. Robertson 97 
- American Crossbill eating Elm Aphis......000000000000.022022222.-- Tracy I. Storer 98 
Further Notes on the Harlequin Duck’s Food Habits —0.00........ -.222-2..22.222--- 
i Oe th eRe 5 Nu i OMe Ns MP UN es 2 ee a Me GR Walter B. Johnstone 98 
: Duck Hawk: Wintering in Ontario, California (i233 2 ee ee 
Aig) Preaek Mee MM re, Ae 3 dot ei Ae Gordon Nicholson and Wright M. Pierce 99 
- The White-eared Hummingbird in the Catalina Mountains, Arizona........ 
DOS Nh ae RON Ne TOMS Man ed hile BENS aly 2 6 ee ee Richard D. Lusk 99 
“On.the Mlockinge’ of Blackbirds:2.24 0 ae Marguerite Rice 99 - 
EDITORIAL NOTES AND NEWS...............4..------ Frere Mr eet ne ee 100 
MINUTES OF COOPER CLUB: MEETINGS 7 is.cccccc8 eee erc eee 100 
Officers of the Cooper Ornithological ‘Clib™ uo eee ee 101 
Directory of Members of the Cooper Ornithological Club ..................-.-.-----.----- 101 
