CINGLUS MEXICANUS. 407 



the very few Pnsseres wliicli are strictly aquatic. Its movements while 

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

 stream, remind one very nmch of the "Teeters" or "Tilt-ups" (Tringoides 

 and BhyacopMlus), for, whethei- niovinn' or stationary, its body tilts up and 

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

 rapidlv along a stream, witli a l)uzzing' flight, following with the greatest 

 ease the tortuous windings of its course without in the least checking its 

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

 flight is usually accompanied b}- a, sharp chattering, especially when one is 

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

 when they alight they desce»d liy a sudden drop, much after the manner 

 of the "Gutter Snipes" {Galluiago). 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 sufficiently dis- 

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



Lifft of specimens. 



230, $ cuL; West Huinboklt Mountains, Nevada, October 4, 1867. 7:^— 11^— 3}i— 

 2i— f — 1 — 1||— f. Upper inaudible, born color, darker terminally; lower, paler, dull 

 light yell6wi.sli basally; iris, burnt-umber; tarsi and toes, clear, glossy, livid white, 

 with a sepia tinge between the scutellaj and on Joints of toes. 



231, 2 ad.; (mate oi preceding). 7|— 11 J — 3=3— 2f — ^\— 1— 2^^ — i Same remarks. 

 248, ad.; West Humboldt Mountains, October 11. Tfi— 11^— 3i|— 3J— f— 1— 2 



— |. Same remarks. 



300, 9 ad.; Truckec River (east of Sierra), November 19. 75— 11|— Sf— 2ii— 1|— 

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

 space on upper below nostril, brownish-white; iris, bright hazel; tarsi and toes, clear, 

 bright, lilaceous-white; divisions of scutella?, and sides of toes, abruptly, sepia. 



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

 Parker.] 



1378, S juv.; Pack's Canon, Uintah Mountains, Utah, .Inly 7, 18C9. 7g— 12i. 

 Upper mandible, and tip of lower, dark plumbeous; lower mA\i(\\h\c, salmon-orange, 

 this color tinging the upper at the base, and along commissure; iris, grayish-brown ; 

 tarsi and toes, whitish-lilaceous; under side of toes, dusky, the pellets yellow. 



