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 THE CONDOR VOL. IX NESTING OF THE PINE SISKIN IN CALIFORNIA BY H. W. CARRIGER AND J. R. I'IMBERTON URING the months of April, May and June, of 1903 and 1904. the writers examined in San Mateo and San Francisco Counties some twenty-five sets of the eggs of the pine siskin (Sinus pinus pinus). Owing to the loss of Car- riger's coll<tion and notes in the n Francisco fire the number of sets taken is not exactly known, but approxinmtely ten sets were taken. To the writers' know- ledge these are the only authentic eggs of this binl ever taken in California and a sho description of their taking may not be uninterting to CONDOR readers. The taking of a male siskin with test fully developed on April 5, in Marin County. and the seeing of several pairs of birds in San Mateo County a few days later, led to the suspicion that the birds were nesting in the vicinity TYPICAI, NEST OF PINE SISKIN IN CYPRESS of n Francisco. Diligent searching for the birds had its result, and on April 12, 1903, a small settlement of siskins was discovered in San Mateo County about a mile from n Francio Bay. During the following two months every opportu- nity was taken to study this interesting bird, On Apr{1 12, 1903, two partially built nests were found by watching the birds carrying dry gras from the fields to the nests. On April 23, 1903, our first t of eggs was taken from nest number two. The nest was twelve ft from the ground, on the top of a long cyprus limb which hung dirtly over a well-traveled road. There were four eggs in this set, and one would have thought them worth four ]mndred dollars from the care we tk in packing them. Of over forty nts fonnd of the pine siskin, only one was not built in a cypress tree, and this one was in the very top of a fifty-foot eucalyptus. The nts were built in full-grown cypress trs planted in rows along roads or as division- lines betwn fields. Nests were usually about twelve or fifteen feet from the ground, but notes show rords of several forty feet up, and one fifty feet frdm the ound. The site