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 88 THE CONDOR Vol. XX wing, 90.3 ram.; tail, 108.2; culmen, 12.8; tarsus, 27.5; hind toe .and claw, 19.2; length of white spot on inner web of outer rectrix, 31.5. No. 28456, female adult: wing, 84.4 rara.; tail, 100.0; culmen, 13.0; tarsus, 28.0; hind toe and claw, 20.7; length of white spot on inner web of outer teetrix, 29.5. The above meas- urements will be best understood when compared with the tables in Swarth's re- vision of the California spotted towhees (CoNyoR, xv, 1913, p. 175). In establishing this identification I have had the advantage of the experience of Mr. Harry S. Swarth with this group. He has gone over the material here re- ported upon and has concurred in the above conclusions. Sitta carolinensis tenuissima, new subspecies Inyo Slender-billed Nuthatch Type.--Male adult, no. 28716, Mus. Vert. Zool.; Hanaupah Canyon, '8700 feet altitude, Panamint Mountains, Inyo County, California; June 1, 1917; collected by J. Dixon; orig. no. 6114. Diagnostic characters.--Similar to Sitta carolinensis aculeata from west-cen- tral California, but bill much longer and slenderer (see fig. 11), size larger, back of a darker tone of' gray, and flanks paler; similar to S.c. nelsoni from southern Arizona, but bill much slenderer (see fig. ]1), and sides, and lower surface gen- erally, whiter. Fig. 11. BrLLS OF THREE WESTERN SURSPECIES OF WHITE-BREASTED NUT- HATCH ( Sitta carolinensis ) ; ALL NATURAL SIZE. a. S.C. aculeata, 8 AD.; NO. 5344, MUS. VERT. ZOOL.; MT. DIABLO, CON- T COSTA CO., CALIF.; APSIL 18, 1896. b. S.C. tenuissima,  AD.; NO. 28716, MUS. VERT. ZOOL.; PANAINT ITS., INYO Co., CALIF.; JUNE 1, 1917. c. S.c. nelsoni,  AD.; nO, 27781, MUS. VEST. ZOOL.; SIER'AXgCHA, GILA Co., Amz.; JUXgE 24, 1917. Remarks.---A series of 21 specimens of this new nuthatch (nos. 28716-28736, Mus. Vert. Zool.)from the Panamint and White mountains includes eleven young and ten adults. The latter are listed in the accompanying table of meas- urements. In some respects this race is intermediate between the Rocky Moun- tain form and that of the Pacific coast region, but in the extreme slenderness o bill differs from either. Judging from. the table of measurements given by RidE- way (Birds N. and Mid. Amer., pt. m, 1904, p. 445) the range of S.c. tenuissima is likely to be found to extend north along the western rim of the Great Basin at least to Fort Klamath, Oregon.. In view of Ridgway's synopsis ad descriptions of the previously known forms of Sitta carolinensis (lee. tit., pp. 440-450), it seems unnecessary to go into further comparisons here.