430 EULLETIJSr 50, UNITED STATES NATIONAL MUSEUM. 



Yuung male. — Similar to the adult female, but under parts as in the 

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

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



Young female. — Similar to the young male, but alwaj^s (?) 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 Da^ds 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 River; 

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

 Altos). 



Psaltrij)<iru>i Uuydi Sennett, Aiik, v, Jan., 1888, 43 (Limpia Canon, near Fort 

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

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

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

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

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



Psaltriparus melanotis lloydi Oberholser, Auk, six, July, 1902, 301 (Fort Davis, 

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



Alegithalos] lloydi Hellmayr, Tierreich, 18. Lief., Mar., 1903, 112. 



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

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

 1877, 415 (do.). 



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

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

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



Psaltriparus santarific Ridgway, Proc. U. S. Nat. Mus., x, Oct. 12, 1888, 697 (Santa 

 Rita Mts., 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. 



Alegithalos'] santaritae Hellmayr, Tierreich, 18. Lief., I\lar., 1903, 113. 



PSALTRIPARUS PLUMBEUS (Baird). 

 PLUMBEOUS BUSH-TIT. 



Entirel}^ similar to those females of J*, m. lloydi 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 mule (if s^pecimens are correctly sexed ) sometimes lacks any black on 

 side of head. 



^The relationship of this form to P. melanotis lloydi 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 



