_Cinclus pallasi_, BON. Zoöl. Jour. II, 1827, 52 (not the Asiatic species). _Cinclus mexicanus_, SW. Phil. Mag. 1827, 368.—SCLATER, Catal. 1861, 10.—SALVIN, Ibis, 1860, 190; 1867, 120 (Guatemala).—BAIRD, Review, 60.—DALL & BANNISTER (Alaska).—COOPER, Birds Cal. 1, 25. _Hydrobata mexicana_, BAIRD, Birds N. Am. 1858, 229.—COOPER & SUCKLEY, Rep. P. R. R, XII, II, 1859, 175 (nest). _Cinclus americanus_, RICH. F. B. A. II, 1831, 273. _Cinclus unicolor_, BON.; _C. mortoni_, TOWNS.; _C. townsendi_, “AUD.” TOWNS. Figures: BONAPARTE, Am. Orn. II, 1828, pl. xvi, fig. 1.—AUD. Orn. Biog. pl. ccclxx, 435.—IB. Birds Amer. II, pl. cxxxvii. SP. CH. Above dark plumbeous, beneath paler; head and neck all round a shade of clove or perhaps a light sooty-brown; less conspicuous beneath. A concealed spot of white above the anterior corner of the eye and indications of the same sometimes on the lower eyelid. Immature specimens usually with the feathers beneath edged with grayish-white; the greater and middle wing-coverts and lesser quills tipped with the same. The colors more uniform. Length, 7.50; wing, 4.00; tail, 2.55. _Young._ Similar to the adult, but much mixed with whitish medially beneath; this in form of longitudinal suffusions. Autumnal and winter specimens have numerous transverse crescents of whitish on lower parts and wings,—these very especially conspicuous posteriorly; the secondaries are also conspicuously terminated with a white crescent. Bill brown, paler toward base of lower mandible. In spring and summer the bill entirely black, and the whitish markings almost entirely disappear; the young bird has a greater amount of white beneath than the adult in winter dress, and this white is disposed in longitudinal, not transverse, suffusions. The color of the legs appears to be the same at all seasons. [Illustration: PLATE V. 1. Cinclus mexicanus, _Sw._ N. M., 8496. 2. Sialia mexicana, _Sw._ Cal., 10623. 3. “ sialis, _Baird_. D. C., 28245. 4. “ arctica, _Sw._ Rocky Mts., 18319. 5. Phyllopneuste borealis. Alaska, 45909. 6. Saxicola œnanthe, _Bechst._ France, 18959. 7. Regulus cuvieri, _Aud._ (From Aud.’s plate.) 8. “ satrapa, _Licht._ D. C., 1160. 9. “ calendula, _Licht._ Penn., 736.] Specimens, of any age, from the coast of Oregon and the Cascade Mountains, have the head more deeply brownish than those from other regions. HAB. Found through the mountainous region of the central and western part of North America, from Fort Halkett south into Mexico and Guatemala. Orizaba (Alpine region) SUMICH. None received from the coast region of California. Abundant on the N. W. coast, Laramie Peak and Deer Creek, Neb. This species has a wide range along the mountainous region of North and Middle America. Mexican specimens are darker.