LAMELLIROSTRES ANATIDAE DAFILA ACUTA. 



473 



insects and crustaceans abound. The species winters in great numbers in 



New Mexico along the Rio Grande. 



ANAS OBSCURA, Gmel. 

 Black Duck. 



Anas obscura GMEL., Syst. Nat., i, 1788, 541. BD., Birds N. A., 1858, 775. HENRY, 

 Tree. Acad. Nat. Sci. Phila., 1859, 109 (New Mexico). SNOW, Birds Kan., 

 1872, 15. COUES, Key N. A. Birds, 1872, 285. YARROW & HENSHAW, 

 Rep. Orn. Specs., 1872, Wheeler's Exped., 1874, 31. COUES, Birds North-- 

 west, 1874, 560. 



The Black Duck is quite restricted in its western range, and I am able 

 to find no note of its occurrence farther west than Kansas. Upon Dr. 

 Yarrow's authority, it appears to be a bird of Utah, he having seen a num- 

 ber of what he believed to be this species at Rush Lake in November. 



DAFILA ACUTA (Linn.). 



Sprig- or Pin-tail Duck. 



Anas acuta, LINN., Syst. Nat., i, 1706, 202. 



Dajila acuta, BD., Staus. Rep. Exp. Great Salt Lake, 1852, 323. WOODH., Sitgreave's 

 Exp. Great Salt Lake, 1854, 103 (New Mexico, Cal.). NEWB., P. R. R. Rep., 

 vi, 1857, 102 (California; Oregon). BD., Birds N. A., 1858, 770. KEN- 

 NERLY, P. R. R. Hep., Whipple's Route, x, 1859, 34. HEERM., P. R. R. 

 Rep., x, pt. iv, 1859, 69. BD., U. S. & Mex. Bound. Surv., ii, pt, ii, 1859, 

 Birds, 26. XANTUS, Proc. Acad. Nat. Sci. Phila., 1859, 195 (Fort, Tejon, 

 Cal.). HENRY, Proc. Ac;td. Nat, Sci. Phila,, 1859, 109 (New Mexico). 

 COOP. &SUCKL., P. R. R. Rep., xii, pt, ii, 1860, 253. HAYD., Trans. Am. 

 Pbil. Soc., xii, 1862, 175. COUES, Proc. Acad. Nat. Sci. Phila., 1866, 98. 

 SNOW, Birds Kan., 1872, 15. ALLEN, Bui. Mus. Conip. Zool., 1872, 183. 

 MERRIAM, U. S. Geol. Surv. Terr., 1872, 703. YARROW & HENSHAW, Rep. 

 Oru. Specs., 1872, Wheeler's Exped., 1874, 31. HENSHAW, Rep. Orn. Specs., 

 1873, Wheeler's Exped., 1874, 146. COUES, Birds Northwest, 1874, 561. 



During the fall, this duck is found in greater or less numbers among 

 the throngs of the other species that visit this region on their way to the 



