518 BU-LLETIN 50, TJNITED STATES NATIONAL MUSEUM. 



middle lectriccs) mostly black, the lateral i-ectriccs broadly bari'ed 

 with white, the rest crossed near tip by a broad subterminal bar or 

 band of white; the outer webs of all except outermost pair broadly 

 barred or^ banded basally with brownish gray;" wing-coverts and 

 tertials mainly grayish spotted with dusky and also more or less 

 varied with whitish bars or streaks, especially on smaller coverts; 

 alula, primar3' coverts, primaries, and secondaries (except tertials) 

 dusky, their outer webs conspicuously spotted with white or brownish 

 white; a broad, conspicuous, and sharply defined superciliary stripe 

 of white, usually margined above by a narrow line of black; a broad 

 brown postocular stripe occupying upper portion of auricular region, 

 but extending beyond to side of neck; lores grayish; rest of sides of 

 head white, or brownish white, the lower part of the auricular region 

 streaked with black or dusky; chin, throat, and chest white, more or 

 less heavily spotted (rarely broadly streaked) with black; breast white 

 or bufi'y white, deepening into ochraceous-buff or cinnamon-buff on 

 flanks, abdomen, and anal region, the whole surface marked with gut- 

 tate or elliptical streaks or spots of black, these larger and broader 

 (roundish or cordate) on flanks; under tail-coverts white or buffy with 

 large cordate or roundish spots of black; maxilla dusky horn color 

 with paler tomia; mandible light horn color (in dried skins); iris red; 

 legs and feet light horn color (in dried skins). 



Young. — Essentially like adults, but paler marldngs of upper parts 

 less sharply defined, pale brownish buff or dull brownish white; pileum 

 and hindneck duller brown; outer webs of primaries and secondaries 

 spotted with pinkish buff instead of white, and blackish spots on throat 

 and chest much smaller, the former sometimes almost immaculate. 



Adult TO«/<^.— Length (skins), 174-198 (187); wing, 80-87.5 (84.3); 

 tail, 73-83.5 (78.9); exposed culmen, 20-23 (21.4); tarsus, 26.5-29 

 (27.5); middle toe, 17-19.5 (18.6).* 



Adult female.— LQngt}i (skins), 173-189 (180.9); wing, 77-83.5 (80.3); 

 tail, 74-80(75.4); exposed culmen, 18.6-23 (20.1); tarsus, 25-28 (26.3); 

 middle toe, 17-19 (18.2).* 



Coast district of southern Sonora (Alamos; Batamotal; Camoa; 

 Guaymas). 



« The white bars or bands ou the outermost rectrices are interrupted at the shaft, 

 and usually those on opposite webs are alternate; that is, each white bar is opposite 

 a black one on the opposite web. Sometimes there is only one distinct white bar 

 (or transverse spot) on the inner web of the lateral rectrix, this near the end; again, 

 the inner web of the second rectrix may show several more or less well-developed 

 white bars. In fact, there is as great an amount of individual variation, without 

 regard to locality, in the barring of the lateral rectrices as in the color and markings 

 of the back. 



^ Ten specimens. 



