BIRDS Oi' NORTH AND MIDDLE AMERICA. 677 



dd. Head and neck not brown, but nearly concolor with rest of plumage; 

 upper parts slate-gray, under parts ash gray. (Highlands of Costa Eica 



and Chiriqui. ) . . . _ Cinolus ardesiaous, adults (p. 681 ) 



cc. Under parts mottled with whitish or pale rusty. 

 d. Under parts mottled with whitish, the throat mostly (sometimes entirely) 



"white Cinclua mexioanus unioolor, young (p. 679) 



dd. Under parts mottled with pale rusty, cinnamon or fawn color, the throat 



without white Cinolus mexicauus mexicanus, young (p. 678) 



66. Under parts white (becoming light gray on sides and flanks) . 



Cinolus ardesiaous, young (p. 682) 

 aa. Inner webs of remiges with a large white patch. (South American species.) 

 d. Head mostly white; no rufous. 



0. Under parts of body slate color or sooty; no white on back (except concealed 



d. General color brownish slate. (Mountains of Santa Marta, Colombia. ) 



Cinolus rivularia (extralimital)« 

 dd. General color very dark brownish sooty. (Mountains of Bolivia and 



Peru. ) Cinolus leuoooeplialus (extralimital) 6 



cc. Under parts of body white, except sides, flanks, and under tail-coverts; back 

 with a white patch. (Mountains of Venezuela, Colombia, and Ecuador.) 



Cinolus leuoonotns (extralimital) " 

 66. No white on head; throat rufous. (Mountains of Argentina. ) 



Cinolus sohulzi (extralimital)'^ 



CINCLUS MEXICANUS MEXICANUS Swainson 

 MEXICAN DIPPER. 



Adults in s-pi^ing and summer. — Head and neck plain sepia brown, 

 darker on the pileum, paler on chin and throat; rest of plumage 

 (except larger wing-coverts, remiges, and rectrices) plain dull slate 

 color, the under parts slightly paler and more brownish, anteriorly 

 gradually merging into the brown of foreneck; greater wing-coverts, 

 alula, primary coverts, remiges, and rectrices dull blackish slate or 

 dusky margined with slate color; larger tmder wing-coverts, longer 

 under tail-coverts, and (at least in more early spring specimens) 

 feathers of lower abdomen and posterior flanks margined terminally 

 with gi'ayish white or brownish white; bill black; iris brown; legs 

 and feet light horn brownish (in dried skins). 



"Cmclus rivularis Bangs, ' Proc. Biol. Soc. Wash., xiii, Nov. 11, 1899, 105 (Chirua, 

 province of Santa Marta, Colombia, 7,000 feet alt. ; coll. E. A. and 0. Bangs) . 



b Oinclus leucocephalus Tschudi, in Wiegmann's Archiv. fiir Naturg., 1844, 279. — 

 Baird, Eevievf Am. Birds, 1864, 60.— Salvin, Ibis, 1867, 121 (monogr.).— Sharpe, Cat. 

 Birds Brit. Mus., vi, 1881, 321. 



"Cfinclus leuconotm Sclater, Proc. Zool. Soc. Lond., 1857, 274 (Bogota, Colombia; 

 coll. P. L. Sclater); Cat. Am. Birds, 1862, 10, pi. 2.— Baird, Review Am. Birds, 1864, 

 60.— Salvin, Ibis, 1867, 122 (monogr.).— Sharpe, Cat. Birds Brit. Mus., vi, 1881, 320. 



<^ Olnclua schulzi Cabanis, Ornith. Centralb., vii, 1882, 182 (Cerro Vayo de Tucu- 

 man, Argentina; coll. Berlin Mus.?); Journ. fiir Orn., 1883, 102, pi. 2, fig. 3. — Sclater 

 and Hudson, Argentine Orn., i, 1888, 11, pi. 2. 



