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 oo. ........... T,H E CONDOR ....... ,:., ...... : . . I Vol. IV

kret.. ...... T?E--'c adt; ;3..,2 ' .i.' J. G.; Camp Chileo, Sierra San Gabriel, Los Angeles County, California 5t'ly. 6 .87  ,oo.l,ctetl;by J. Grinnell. RANGff-Tie Southern Sierras of California (Transition and lower Boreal Zones) from the Tejon Mountains (probably,) south to the Cuyamaca Mountains. REMARKs--The differences between A'. albolarvatus and 2(. gravirostris are slight, and apparently exist only in dimensions, chiefly those of the bill, as shown in the accompanying drawings. The relative extent of white and black areas in the two forms seems to be identical. The size of the bill in the two cases is re- markably constant, but in two instances at hand individual variation brings an overlapping of characters. In a specimen from Red Point, Placer County, the bill is as long as the average from the San Bernardino Mountains, but at the same time it is slenderer so that the total bulk is conspicuously less. The bird from the San Bernardino Mountains with the shortest bill is in this dimension equal to the average of albolarvatus, but the thickness is much greater than in any of the latter. The drawings are from selected average examples, not extremes. The material at hand does not justify subspecific treatment of these two forms. Geographical continuity of ranges possibly exists; but it seems quite as likely that there is a broad hiatus in the vicinity of Tehachapi Pass, whence I can find no record of the white-headed woodpecker. The following adult specimens from California have been examined: X. albolarvatus--Kernville 4 (probably neighboring mountains); Big Trees, Calaveras Co., 2; Cisco, Placer Co. 2; Snow Mt., Colusa Co. 2; Echo, El Dorado Co. 4; Eagle I, ake, Lassen Co. 5; Lights Canyon, Plumas Co. I; Red Point, Placer Co. 3; Horse Creek, Siskiyou Mts. 3.--Total, 26. X. gravirostris--San Bernardino Mts., San Bernardino Co. z3; San Gabriel Mts., Los Angeles Co. 3.--Total 6. g Figs. A and B--X. albolarvatus, , No. 5xo8 Coil. J. G., Horse Creek, Siskiyou Mts. Figs. C and D--A:gravirostris,, Type, No. 2926 Coil. J. G., Sierra San Gabriel, Los Angeles Co.