'?Iar., 1918 NEW BIRDS FROM EAST-CENTRAL CALIF ,(,?.?1%. ?', .'. ,.. .: 89
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MEASUREMENTS (IN MILLIMETERS) OF TEN ADULT SPECIMENS OF ?ITTA (7AROLI2?E2?Ifg TEBZUI?IMA, FROM THE INYO REGION OF. CALIFORNIA Mus. Sex Locality ? be ? ? No. ? : ' ? ? 28716 ? Hanaupah Canyon, 8700 ft., Panamint M?. June 1 91.3 52.1 21.7 4.0 28717 ? Head of Silver C?yon, 9800 ft., ?hite Mrs. July 13 92.4 50.5 20.4 3.9 28718 ? Silver Canyon, 7000 ft., ?hite Mrs. July 18 89.5 49.9 20.0 3.8 28721 ? Big Prospector Mead., 10600 ft., ?ite ?ts. July 25 87.9 44.8 20.2 3.7 28723 ? Big Prospector Mead., 10360 ft., ?hRe Mrs. July 26 86.8 45.7 20.0 4.0 28728 ? Poison Creek, 9800 ft., ?lte Mrs. Aug. 3 89.4 52.3 21.0 3.7 28736 ? 3 ?. E. Jackass Spr., 6200 ft., Panamint Mrs. Sept. 30 89.3 47.8 20.0 3.8 28719 9 Silver Canyon, 7000 ft., ?hite Mrs. July 18 86.0 45.0 20.0 3.8 28722 9 Big Prospector Mead., 10500 ft., ?lte Mrs. July 25 87.1 44.0 20.3 3.8 28727 9 Big Prospector Me?., 10300 ft., ?lte Mrs. JR?Y 30 85.0 43.2 21.0 4.0 Hylocichla guttata polionota, new subspecies White Mountains Hermit Thrush Type.---Male immature (passing from juvenal to first annual plumage, the latter predominating); no. 288:?8, Mus. Vert. Zool.; Wyman Creek at 8000 feet altitude, east slope of White Mountains, in Inyo County, California; August 18, 1917; collected by H. G. White; orig. no. 1305. Diagnostic characters (among the races of Hylocichla guttata, for general definitions of which see Ridgway, Birds N. and Mid. Amer., pt. ?v, 1907, pp. 35- 51).--Size large, between that of H. g. sequoiensis of the Sierra Nevada and of H. g. a?duboni of the l?ocky Mountains, nearest the former. Color of top of head and dorsum different from that in either of these races and, in fact, from that in any previously known race of Hermit Thrush. The tone of this coloration is the "olive-brown" of Ridgway (Color Standards and Color Nomenclature, 1912, pl. 40), and is close to that of the corresponding areas in the Olive-backed Thrush (Hylocichla ustulata swainsoni); it is if anything even more slaty. Measurements.---Average of 12 males, all from the White Mountains: Wing, 98.6; tail., 73.8; exposed culmen, 12.7; tarsus, 29.8. For extremes, see accom- panying table. The 'specimens raeasured are all but two full-grown juvenals. As regards wing and tail the dimensions of these young bi. rds are, of course, perfect- ly valid; for there is no molt in the spring and the rectrices and. remiges of the same aged birds the next summer (then "adult") would be the same feathers, only more or less badly abraded. The measurements of culmen and tarsus are, however, less in these juvenals than in older (adult) birds, and this must be taken into account in comparisons with summer adults. Range.--In summer, the Canadian and Hudsonian zones on the White l?Iountains, in Mono and Inyo counties, California. Places of capture of our 14 specimens were as follows: Cottonwood Creek at 9000-9200 feet, 7; Poison Creek at 9500-9900 feet, 3; Wyman Creek at 8000 feet, 4. Remarks.--The race sequoiensis, of the Sierra Nevada just across Owens Val- ley to the west and in plain sight from the White Mountains, is ordinarily re- ferred to as a pale-colored or even grayish-colored Hermit Thrush; but compared with polionota, the contrast in dorsal view is as of brown with slate-gray. The resemblance of polionora to the Olive-backed Thrush is striking. The juvenal plumage of polionota is as distinctive in slaty tone of coloration as is the first annual. The two breeding "adults" in the series are in such worn
