430 BULLETIJSr 50, UNITED STATES NATIONAL MUSEUM. 



Young maZe.— Similar to the adult female, but under parts as in the 

 adult male (without buffy tinge), except that the sides and flanks are 

 very slightly, if at all, tinged with 6cru drab or vinaceous. 



Young female.— Similar to the young male, but always (?) without 

 blackish spot or suffusion on sides of occiput <* and with the under 

 parts of body faintly tinged with buff. 



Southwestern Texas (Chisos, Guadalupe, and Davis mountains, 

 Alpine, Paisano, etc.), southern New Mexico (Silver City) and south- 

 ern Arizona (Chiricahua, Huachuca, and Santa Rita mountains, Camp 

 Bowie, etc.), and southward into northern Sonora (Bavispe RivBr; 

 Puerto de los Pinitos) and Chihuahua (Jesus Maria; Bravo; Pinos 

 Altos). 



Psaltriparus Uoydi Sennett, Auk, v, Jan., 1888, 43 (Limpia Canon, near Fort 

 Davis, Presidio Co., s. w. Texas; coll. G. B. Sennett).— Chapman, Auk, v, 

 1888, 400. — American Oknithologists' Union, Check List, 2d ed., 1895, 

 no. 745.— Allen, Bull. Am. Mus. N. H., v, 1893, 41 (Bavispe E., n. e. 

 Sonora, Dec.).— Eidgway, Man. N. Am. Birds, 2d ed., 1896, 611.— Bailey 

 (Florence M.), Handb. Birds W. U. S., 1902, 462. 



Psaltriparus melanotis Uoydi Oberholsbe, Auk, xix, July, 1902, 301 (Fort Davis, 

 Chisos Mts., and Ord Mts. south of Alpine, s. w. Texas). 



Alegitkalos] Uoydi B.elimay-r, Tierreioh, 18. Lief., Mar., 1903, 112. 



(??) Psaltriparus inelanotis (not Parus melanotis Hartlaub) Eidgway, Bull. Essex 

 Inst., vii, 1875, 20, 35 (East Hamboldt Mts., Nevada); Orn. 40th Parallel, 

 1877,415 (do.). 



Psaltriparus melanotis Eidgway, Nom. N. Am. Birds, 1881, no. 49, part; Man. 

 N. Am. Birds, 1887, 565, part (Eio Grande "Valley). — American Ornithol- 

 ogists' Union, Check List., 1886, no. 745. 



Psaltriparus santaritx'RiTKiViiiy, Proc. U. S. Nat. Mus., x, Oct. 12, 1888, 697 (Santa 

 EitaMts., s. Arizona; coll. U. S. Nat. Mus.); Man. N. Am. Birds, 2d ed., 

 1896, 611.— American Ornithologists' Union, Check List, 2d ed., 1895, no. 

 744. 1.— Bailey (Florence M.), Handb. Birds W. U. S., 1902, 462. 



AlegithaZosI santaritae Hellmayr, Tierreich, 18. Lief., Mar., 1903, 113. 



PSALTRIPARUS PLUMBEUS (Baird). 

 PLUMBEOUS BUSH-TIT. 



Entirely similar to those females of P. in. Uoydi having no black 

 on sides of head, but averaging grayer and more uniform beneath, 

 with the throat and chest usually little, if any, paler than other under 

 parts; adult male never with any black on sides of head. ^ 



"The young male (if specimens are corredtly sexed) sometimes lacks any black on 

 side of head. 



i The relationship of this form jto P. melanotis Uoydi affords a problem very difficult 

 of solution and of exceptional interest in connection with the discrimination between 

 species and subspecies. Judging from specimens alone, it is difficult to escape the 

 conclusion that the two forms intergrade completely; at least I find myself unable 

 to satisfactorily refer a very large percentage of specimens obtained within the area 

 of overlapping of their respective ranges. But Mr. Oberholser, who has had excel- 

 lent opportunities of studying both forms in life, assures me that they not only both 



