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 THE CONDOR A lfaazire of ffestern Ornitholo Published Bi-MoMy by the Cooper Ortholoc Club Endred  sendla tr Feb12. 1, at the ffice at  Aeles (Holly Station). Calllomb. under A of Cone of March 3, 1879. Issued from the Office of TH CONOR,  E. D. Diaz. t Natiol nk. Ho11, Ciforn SUBSCRIPTION RATES TWo Dollars per Year in the United States, payable in advance. Forty Cents the single copy. Two DoJlars end Twenty-five Cent per Year in all other countries in the International Postal Union. COOPER CLUB DUES Two Dollars oer year for members residing in the United States. Two Dollars end Twenty-five Cents in all other countries. Mumcripts for publlcaLon, and Books and Papers for Review, should be sent to the Editor. J. ORIl%Tl'ELL. Museum of Vertea 1o, Univeity of Cifoia, ley. Californh. Cms for issi or imofect num should  made of the Bness Manager,  addred 1ow. tn thly days of da of ue. Cooer Club Due SubcooM to The Condor. and Exchuer, should  sent to e Biness Manager. For the Purchme of B&ck VoJum of The Condor or of the Pafic oMt AwiJau sies, app to the Busine Mag. W. L CHUS, Business Maner, gle Rk,  geles County, Callfoia. _lrssed $epgernber $0, 1919 CONTENTS Autobiographical Notes (continued) (with portrait) ............................................ ............................................................................... .Henry Wetherbee Henshaw 177 Differential Sex Migration of Mallards in New Mexico ................ Aldo Loo10old 182 Description of a Twenty-year Series of Eggs of the Sierra Junco (with four photos by Olu! J. Heinemann) ................................................ Milton '. Ray 184 A Return to the Dakota Lake Region (continued)....Florence Merriam Bailey 189 Bird Notes from Southeastern Oregon and Northeastern California (with five photos) ................................................................................ oorge Willett 194 The Wilson Snipe Nesting in Southern California ........................ Eclwar5 Wall 20? Description of a New Subspecies o Pipilo luscus ............ Harrl C. Oberholser 210 FROM FIELD AND STUDY Fly-catching Birds ................................................................ ffoselol Mailliard 212 A California Specimen of the Sandhill Crane ...................... H. . 'lvarth 212 Sharp-shinned Hawks and Small Birds ................................ Allan Brooks 213 Notes from Inyo County, California ............................ Austin Paul 8mith 213 The California Jay as a Bird Killer .................................... Tracl L torer 214 EDITORIAL NOTES AND NEWS .................................................................................. 214 MINUTES OF COOPER CLUB MEETINGS ............................................................ 216