CINCLUS MEXICANUS. 407 



the very low Passcros which are strictly aquatic. Its movements while 

 walking in the shallow water, or as it stands upon a rock in the bed of a 

 stream, remind one very much of the "Teeters" or "Tilt-ups" {Tringoidcs 

 and Jlhi/acojihiliis), for, whether moving or stationary, its body tilts up and 

 down with an incessant motion. It is more often observed, however, flying 

 rapidly along a stream, witli a l)uzzing flight, following with the greate.st 

 ease the tortuous windings of its com-se wilhout in the least checking its 

 speed ; or dashing swiftly through the spray or foam of a water-fall. Its 

 flight is usually accompanied by a shar]) chattering, especialh' when one is 

 chased by another, as is often the case during the breeding-season ; and 

 when they alight they descend by a sudden drop, much after the manner 

 of the "Gutter Snipes" {Gallinago). Nor are their movements confined to 

 the surface of the water or its neighborhood, for they have been observed to 

 dive into the aqueous element and perform various and dextrous evolutions 

 in its depths, as they pursue their insect-food, propelling themselves by 

 the rapid beating of the wings, in the well-known manner of Grebes and 

 other water-fowl. 



We heard the song of this bird on but one occasion, in October, at 

 Unionville, Nevada. It was a pleasing warble, but not sufliciently dis- 

 tinctive, at least on that occasion, to admit of particular description. 



Lixt of specimens. 



230, 3 ad.; West Huinl)i)l(lt Mountains, Xt'vada, October 4, 18G7. 7.^— 11 J— .3] J— 

 2J— §— 1— ^]{^— |. Upper mandible, born color, darker terminally; lower, paler, dull 

 light .vellowish basally; iri.s, burnt umber ; tar.si and toes, clear, glossy, livid white, , 

 with a sepia tinge between tlie scutelbe and ou joints of toes. 



L'31, e«rf.; (raateof i)receding). T|—11J— 3^—25— ^^g—l—S^V—i- Same remarks. 



248, ad.; West Uumboldt Jlouutiiins, October 11. 7}J— Hi— 3f|— 3J— g— 1— 2 

 — g. Same remarks. 



300, 9 ad.; Truekee River (east of Sierra), November 10. 7J— llf— 3f— 2|J— j|— 

 1^—2— J. Bill, plumbeous black; extreme basal portion of lower mandible, and small 

 si)aec on upi>er below nostril, brownish-white; iris, bright hazel; tar.si and toes, clear, 

 bright, lilaeeouswhite; divisions of seutelhe, and sides of toes, abruptly, sepia. 



324, ad.; 325, ad.; near source of American River, California, November. [H. G. 

 Parker.] 



1378, i juv.; Pack's Cafiou, Uintah Mountains, Utah, July 7, 1809. 7g— 12J. 

 Upper u)audible, and tip of lower, dark plumbeous; lower mandible. xn/HioH-orrt/i/;*', 

 this color tinging the ui)per at the ba.se, and along commissure; iris, grayish-brown ; 

 tarsi and toe.s, whitish lihiceous; under side of toes, dusky, the pellets yellow. 



