360 



ZOOLOGY BIRDS. 



(flaviventris). This latter bird I have often seen in the spring in Massachu- 

 setts, and can speak with certainty of the exact similarity of their habits and 

 motions, a similarity still further borne out in the close resemblance of 

 the two birds. If distinguishable as a race, the western variety appears not 

 to have undergone a very marked differentiation, and the characters assigned 

 to it seem not to be very trenchant. 



EMPIDONAX OBSCUEUS (Swains.). 

 Wright's Flycatcher. 



Empidonax obscurus, BD., Ives' Col. Exped., 1857-58, pt. iv, 5. Id., Birds N. A., 1858, 

 200. I/l, U. S.& Mex. Bound. Surv., ii, pt, ii, 1859, Birds, 9, pi. xi, f. 3. Id, 

 Proc. Acad. Nat. Sci. Pbila., 1859, 303 (Gape Saint Lucas). COUES, Proc. 

 Acad. Nat. Sci. Phila,, 1866, 62 (Fort Whipple, Ariz.). COOPER, Birds Gal., 

 i, 1870, 329. 



Empidonax obscurus, ALLEN, Bui. Mus. Comp. Zool., 1872, 179 (Montana; Colorado; 

 Ogden, Utah). COUES, Key N. A. Birds, 1872, 176. AIKEN, Proc. Bost. 

 Soc. Nat, ilist,, 1872, 206 (Colorado). YAKROW, Eep. Oru. Specs., 1871, 

 Wheeler's Exped., 1874, 35. BD., BREW., & RIUG., N. A. Birds, ii, 1874, 

 381, pi. 44, f. C. YARROW & HENSHAW, Rep. Oru. Specs., 1872, Wheeler's 

 Exped., 1874, 22. HENSHAW, An. Lye. Nat. Hist. N. Y., xi, 1874, 8. 

 Id., An. List Birds Utah, 1872, Wheeler's Exped., 1874, 47. Id., Rep. Oru. 

 Specs., 1873, Wheeler's Exped., 1874, 66, 87. COUES, Birds Northwest, 

 1874, 258. 



This species is found in both the Middle and Southern Regions, and in 

 many localities is an abundant summer resident, while in others it appears 

 to be almost entirely wanting. In Utah, we obtained but a single specimen; 

 in Eastern Nevada, two. In the Wahsatch and Uintah Mountains, how- 

 ever, Mr. Ridgway found it a numerous species, and I have had a similar 



