474 



ZOOLOGY BIRDS. 



south. On the San Pedro River, Arizona, I found it very numerous in 

 October, and perhaps they may remain here for the winter. They are quite 

 shy and timid, and among a promiscuous flock of swimmers are about the 

 first to scent danger, and by their flight communicate the alarm to the others. 



CHAULELASMUS STREPERUS (Liun.). 

 Ciadwall. 



Anas strepera, LINN., Syst. Nat., i, 1766, 200. NEWB., P. R. R. Rep., vi, 1857, 102. 



ChauMasmtts strcpcrvs, WOODU., Sitgreavt's Exp. Zufii & Col. Riv., 1854, 109. BD., 

 Birds N. A., 1858, 782. 1<7., D. S. & Mex. Bound. Surv., ii, pt. ii, 1859, 

 Birds, 27. KENNERLY, P. R. R. Rep., Whipple's Route, x, 1859, 35. 

 HEERM., P. R. R. Rep., x, pt. ii, 1859, 69. Coop. & SUOKL., P. R. R. Rep., 

 xii, pt. ii, I860, 256. COUES, Proc. Acad. Nat. Sci. Pbila., 1866, 99 (Ari- 

 zona). ALLEN, Bui. Mus. Corrip. Zool., 1872, 183. SNOW, Birds Kau., 

 1872, 15. COUES, Key N. A. Birds, 1872, 286. AIKEN, Proc. Bost. Soc. 

 Nat, Hist,, xv, 1872, 240 (Colorado). MEERIAM, U. S. Geol. Surv. Terr., 

 1872, 704. YARROW & HENSHAW, Rep. Orn. Specs., 1872, Wheeler's Exped., 

 1874, 32. HENSHAW, Rep. Orn. Specs., 1873, Wheeler's Exped., 1874, 95. 

 COUES, Birds Northwest, 1874, 503. 



In 1872, a few of this species were found late in November in the sloughs 

 and pools about Provo, Utah ; but they were only the late stragglers from 

 the great numbers which had already passed on to the south. From such 

 information as I could gather I judge that the borders of Utah Lake afford 

 a home in summer for very many of these ducks, and, as the species is 

 southern in its distribution, or at least does not find it necessary to retire to 

 the far north to pass the breeding period, their departure south is similarly 

 early ; and at a time when many other kinds are still abundant in Utah this 

 duck has migrated. At the Alkali Lakes of Southern Colorado one or two 

 Gadwalls were shot in worn plumage, and with all the other evidences 

 of their being in the breeding state, while quite a number of others were 

 seen. 



