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 Mar.,1912 PASSERELLA STEPHENSI IN MA.RIN COUNTY, CALIFORNIA 65 Upon ascertaining this we compared our heavily billed winter visitants with those in our own collection which were now properly identified, and while the resemblance to stephensi came into mind, it was dismissed in accordance with the rule that migrating birds winter south of their breeding grounds (with one or two exceptions, apparently). Hence we came to the conclusion for the moment that there must be an undis- covered form breeding somewhere to the north of us. Our breeding birds from the Sierras were taken east of us and were true megarhyncha, as above mentioned. So we could not look in that direction for anything to correspond. Now, after taking these to Berkeley and going over them most carefully with Mr. Grinnell. we are compelled to place them with stephensi, this, so far as at present known, making another exception to the rule cited above. The accompanying photograph is intended to show the similarity of the Fig. 21. WINTER HOlE OV STEPHENS VOX SPARROW IN IaRIN COUNTY, CALIFORNIA. ROUGH HILLS COVERED WITH DWARFED CYPRESS AN CEAOX.uS A AZAmXA PHOTO BY JOS. MAILLIARD bills of stephensi taken on their breeding grounds and one of the examples from Marin County. Also it shows the difference in size between stephensi and m. egar- h. yncha. No. I was taken on July 15, 1905, by Mr. Grinnell, at an altitude of 7,500 feet, in the San Bernardino Mountains, and is in rather worn plumage, but is stephetzsi without any manner of doubt. No. 2, taken by Br. p. Taylor, July 21, 1911, also in worn plumage, comes from an altitnde of 9,000 feet in the mountains of southern Tulare County, where these birds were found breeding on the west side of the Sierras, and which constitutes the northernmost breed- ing stion of stephensi. No. 3 is from Marin County, and is in fresh fall plumage. These three specimens were selected for photographing on account of the bills being' very nearly the same size, and the makeup of the skins being such that the bills lie in almost the same position in all. No. 3 I have fair reason to