682 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



remiges, and rectrices dull blackish slate or slate-black, margined with 

 slate-gray (these edgings obsolete on primaries and rectrices in worn 

 plmnage); sides of head similar in color to pileum, but slightl}- paler, 

 relieved by a whitish mark on each eyelid; malar region, chin, and 

 throat plain light brownish gra}^ (drab-gray), gradually darkening 

 above into the deeper color of auriculars, etc., posteriorly changing 

 gradually into the clear light gra}^ (nearl}" no. 6) of the under parts, 

 of which the sides, flanks, and under tail-coverts are slightly darker 

 (nearly as dark as upper parts), the longer under tail-coverts indis- 

 tinctly tipped with pale brownish or dull l^rownish white; l)ill l)lack 

 in breeding season, more brownish at other seasons; iris brown; legs 

 and feet pale brownish (in dried skins). '^ 



YouiHj. — Color of upper parts as in adults, but pileum gray, like 

 back, etc;, and larger (middle and greater) wing-coverts and tertials 

 narrowl}' tipped with whitish; under parts dull white (the feathers pale 

 gray beneath the surface), the sides and flanks pale gra}-; bill horn 

 brownish, with basal half of mandible paler; legs and feet pale brown- 

 ish yellow (in dried skins). 



Adult male.—\jQngi\\ (skins), 148-178 (1<>2.7); wing, 81-88 (85); 

 tail, 39-47.5 (44.5); exposed culmen, 10.5-17 (16.7); tarsus, 30-32 

 (31.2); middle toe, 21.5-22 (21.7).* . 



Adult female.— \^&\\gi\\ (skins), 149-101 (154); wing, 79-85 (81); tail, 

 40-45 (42.2); exposed culmen, 17-18 (17.5); tarsus, 29.5-31 (30.6); 

 middle toe, 20.5-22 (21.3).^ 



Mountains of Costa Rica (Dota Mountains), Chiriqui (Volcan de 

 Chiriqui; Boquete), and Veragua (Cordillera de Tole). 



Cindas ardesiacus SAhvi's, Ibis, 2d ser., iii, Jan., 1867, 121, pi. 2 (Cordillera de 

 Tole, Veragua; coll. Salvin and Godman); Proc. Zool. Soc. Lond., 1867, 134 

 (Cordillera de Tol^; crit.).— Lawrence, Ann. Lye. N. Y., ix, 1868, 92 (Dota 

 Mts., Costa Rica).— Frantzius, Journ. fiir Orn., 1869, 290 (Dota Mts.).— 

 Salvin and Godman, Biol. Centr.-Am., Aves, i, 1879, 45. — Sharpe, Cat. 

 Birds Brit. Mus.,vi, 1881, 319.— Zeledon, Cat. Aves de Costa Rica, 1882, 2; 

 Proc. U. S. Nat. Mus.,viii, 1885, 105; Anal. Mus. Nac. Costa Rica, i, 1887, 

 105 (Santa Maria de Dota).— Bangs, Proc. New Engl. Zool. Club, iii, 1902, 

 51 (Volcan de Chiriqui, 4,000 to 7,500 ft., and Boquete, Chiriqui). 



[Cinclvs'] ardcsiacus Sclater and Salvin, Nom. Av. Neotr., 1873, 3. 



C[mclus'] ardesiacus Ridgway, Man. N. Am. Birds, 1887, 538. 



[Cinclus mexicanusi var. ardesiacus Baird, Brewer, and Ridgway, Hist. N. Am. 

 Birds, i, 1874, 56. 



\_Hydrobata'] ardesiaca Gray, Hand-list, i, 1869, 267, no. 3911. 



«In one specimen, from Boquete, Chiriqui, the legs and feet are black, the color 

 being pale brownish, as usual, in six other skins obtained at the same time in the 

 same locality. 



''Three specimens. 



'•Six specimens. 



