BIRDS OF NORTH AND MlDDl.K A.MKKICA. 677 



d<l. Head and neck not brown, but nearly concolor with rest of plumage; 

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



andChiriqui.) Cinclus ardesiacus, adults (p. 681) 



cr. Under parts naottled with wliitish or pale rusty. 



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



white Cinclus mexicanus unicolor, young (p. 679) 



(1(1. Under parts mottled with pale rusty, cinnamon or fawn color, the throat 



without white Cinclus mexicanus mexicanus, young (p. 678) 



hi). Under jiarts white (becoming light gray on sides and flanks). 



Cinclus ardesiacus, young (p. 682) 

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

 /'. Head mostly white; no rufous. 



c. Under parts of body slate color or sooty; no white on l)ack (exci'jit concealed 

 streaks) . 

 */. General color l)rownish slate. (^lountains of Santa Marta, Colombia.) 



Cinclus rivularis (extralinntal)'« 

 (Id. (ieneral color very dark brownish sooty. (Jh)untains of J»olivia and 



Peru. ) Cinclus leucoceplialus (extralimital ) '' 



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

 with a white patch. (Mountains of Venezuela, Colombia, and J^cuador. ) 



Cinclus leuconotus (extralimital) <^ 

 hb. No white on lu'ad; tiiroat rufous, (^lountains of Argentina. ) 



Cinclus schulzi (extralimital)f' 



CINCLUS MEXICANUS MEXICANUS Swainson 

 MEXICAN DIPPER. 



AdulU in spring 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 ])rown of foreneck; greater wing-coverts, 

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

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

 under tail-coverts, and (at letist in more early spring spiM-imens) 

 feathers of lower a))domen and posterior ilaid<s margined terminally 

 Avith grayish white or brownish white; ]»ill black; iris brown; legs 

 and feet light horn brownish (in dried skins). 



c- Cinclus rivularis Bangs, Proc. Biol. Soc. Wash., xiii, Nov. 11, 1899, 105 (Chirua, 

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



^Cinclus leucocepludns Tschudi, in AViegmann's Archiv. fiir Naturg., 1844, 279. — 

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

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



'^ Cinclus leuconotus Sclater, Proc. Zool. Soc. Loud., 1857, 274 (Bogota, Colombia; 

 coll. P. L. Sclater); Cat. Am. Birds, 1862, 10, pi. 2.— Baird, Review Am. Birds, 18(i4, 

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



ii Cinclus scludzi Cabanis, Ornith. Centralb., vii, 1882, 182 (Cerro Vayo de Tucu- 

 man, Argentina; coll. Berlin ^lus.?); Journ. fiir Orn., 1883, 102, |>1. 2, lig. 3. — Sclater 

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



