678 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Adults in autunin and itunter. — Similar to the spring- and .sunnncr 

 pluruage, but feathers of nearl}- all under j)arts more or less distinctly 

 (alwa^'s narrowly) maro-ined with whitish, tiie larger wing-coverts and 

 tertials (sometimes also secondaries, innermost primaries, and rec- 

 trices) also narrowly margined at tips with white, a narrow whitish 

 mark on each eyelid, and the bill horn brownish. 



Young in first autninn and ininter. — Very similar to adults of cor- 

 responding season and perhaps not always distinguishable, ))ut usu- 

 ally (?) with the whitish markings more distinct. 



Young {first plumage). — Similar to autumnal and winter adults, but 

 under parts strorigh^ suffused or indistinctly streaked with cinnamon- 

 buff or fawn color, and without whitish terminal margins' to the 

 feathers; brown of head and neck (especially on chin and throat) less 

 pronounced; larger wang-coverts, narrowly tipped with light brownish 

 gray instead of whitish, and white terminal margins of remiges much 

 narrower, sometimes obsolete. 



Adult 7nale{^.—LQn^t\\{skm^), KJO-lTS (177); wing, 87-92 (90); 

 tail, 48-52 (49.3); exposed culmen, 17-18 (17.5); tarsus, 28-31 (29.3); 

 middle toe, 20-22.5 (21. 5). « 



Adult female.— I^ength (skins), 157-171 (105); wing, 82-89 (86); 

 tail, 43-50 (46.7); exposed culmen, 16-17 (16.2); tarsus, 28-29 (28.6); 

 middle toe, 19.5-21 (20).'' 



Mountains of Mexico and Guatemala northward to States of Sonora 

 (Chuchuichupa) and Chihuahua (Barranca, Jesus Maria, etc.). High- 

 lands of Costa Kica? 



Cinclus mexicanus Swainson, Philos. Mag., new ser., ii, May, 1827, 368 (Temas- 

 caltepec, Mexico; coll. Bullock Mus. ).— Sclater, Proc. Zool. Soc. Lend., 

 1859, 3(32 (Jalapa, Vera Cruz); Cat. Am. Birds, 1862, 10, part (in syno- 

 nymy). — Baied, Review Am. Birds, 1864, 60, part (Jalapa). — Salvin, Ibis, 

 1867, 120, part (monogr.).— Sumichrast, Mem. Bost. Soc. N. H., i, 1869, 544 

 (temperate and alpine regions Vera Cruz, 1,000 to 2,500 meters). — Cooper, 

 Orn. Cal., 1870, 25, part (Mexico). — Baikd, Brewer, and Ridgway, Hist. N. 

 Am. Birds, i, 1874, 56, part (Mexico; Guatemala).— Coues, Birds N. ^Y., 1874, 

 10, part (Mexico; in synonymy); Birds Col. Val., 1878, 89, part (do.). — 

 Salvin and Godman, Biol. Centr.-Am., Aves, i, 1879, 44 (Tierra Fria and 

 Temiscaltepec, Mexico; Oaxaca; Jalapa, etc.. Vera Cruz; ridge above Toto- 

 nicapam, Guatemala). — Sharpe, Cat. Birds Brit. Mus., vi, 1881, 317, part 

 (Mexico; Guatemala). — American Ornithologists' Union, Check List, 1886, 

 no. 701, part (Mexico; Guatemala) .— (?) Cherrie, Auk, viii, 1891, 395 (moun- 

 tains of Costa Rica; common c).— Allen, Bull. Am. Mus. N. H., v, 1893, 41 

 (Chuchuicliapa, Sonora). 



Cinclus mexlr<mus? Salvin, Ibis, 186(5, 190 (ridge above Totonicapam, Guatemala, 

 10,000 ft. alt.). 



"Three specimens; one with sex not determined (from Jalai)a, Vera ('ruz; no. 

 35749, coll. Acad. Nat. Sci. Phila.). 



''Six specimens, from Chihuahua (Barranca, Jesus Maria) and Sonora (Chuchui- 

 chupa) . 



<^No Costa Kican specimens seen by me. Possibly they represent a different form. 



