62 BULLETIN 50, UNITED STATES NATION.\L MUSEUM. 



[Turdus {Hylocichla) swainsoni] b. alidse Coues, Birds Col. Val., 1878, 35, 36 

 (synonymy; diagnosis). 



Turdus swainsoni alidse Roberts, Bull. Nutt. Orn. Club, iv, July, 1879, 152 

 (Minneapolis, Minnesota, May 11). 



Turdus ustulatus alidse Coues, Check List, 2d ed., 1882, no. 12.— Loomis, Auk, 

 ii, 1885, 190 (Chester Co., South Carolina). 



T[urdus] u[stulatus] alidse Coues, Key N. Am. Birds, 2d ed., 1884, 247. 



E\ylodchla] alidx Ridgway, Proc. Ac. Nat. Sci. Phila., June, 1869, 127, in text. — 

 Jordan, Man. Vertebr. E. U. S., 4th ed., 1884, 47.— Coues, Key N. Am. 

 Birds, 5th ed., i, 1903, 255. 



Eylodchla alidse Ridgway, Proc. U. S. Nat. Mus., iii, Aug. 24, 1880, 166; Norn. 

 N. Am. Birds, 1881, no. 3.— Bean, Proc. U. S. Nat. Mus., v, 1882, 145 (St. 

 Paul, Kadiak I., July 13). — McLenegan, Cruise "Corwin," 1884, 113 (Kowak 

 R., Alaska, breeding; descr. habits, song, and nest). — Turner, Proc. U. S. 

 Nat. Mus., viii, 1885, 235 (Fort Chimo, Ungava, breeding). — American Orni- 

 thologists' Union Committee, Auk, xvi, 1899, 127. — Allen, Bull. Am. 

 Mus. N. H., xiii, 1900, 183 (Bonda, etc., Santa Marta, Colombia, Oct. 7 to 

 Apr. 7); Auk, xvii, 1900, 367 (do.).— Chapman, Bull. Am. Mus. N. H., 

 xvi, 1902, 246 (Sheep Creek, Kenai Peninsula, breeding; crit.). — McGregor, 

 Condor, iv, 1902, 144 (Cairn, Dexter, Cape Denbigh, and Besboro I., Alaska). 

 Preble, North Am. Fauna, no. 22, 1902, 129 (York Factory and Fort Churchill, 

 breeding; descr. young). — Bailey (Florence M.), Handb. Birds W. U. S., 

 1902, 469.— Osgood, North Am. Fauna, no. 24, 1904, 81 (Swan Lake, Kakh- 

 teul R., Aleknagik Lake, and Nushagak, Alaska). 



[Eylodchla] alidx Heine and Reichenow, Nom. Mus. Hein., 1890, 3. — Sharpe, 

 Hand-list, iv, 1903, 142. 



Eylodchla alidae alidae Schalow, Vogel der Arktis, 1904, 267. 



Tiurdus] sivainsonii (not of Cabanis, 1847) Cabanis, Mus. Hein., i, 1850, 5 

 (Siberia). 



Turdus swainsoni (not of Cabanis) Cordeaux, Ibis, 1875, 177 (Heligoland, 1 

 spec, Oct. 2, 1869).— Seebohm, Ibis, 1877, 164 (Heligoland); 1892, 7 (Heli- 

 goland).— Dalgleish, Bull. Nutt. Orn. Club, v, 1880, 68 (Heligoland). 



(?) Turdus minor (not of Gmelin?) Reinhardt, Journ. fiir Orn., 1854, 427 (Green- 

 land); Ibis, 1861, 6 (Greenland). 



HYLOCICHLA ALICIiE BICKNELLI Ridgway. 

 BICKNELI'S THRUSH. 



Similar to //. a. alidse, but decidedly smaller, coloration of upper 

 parts averaging browner " (olive-sepia to sepia brown) and bill aver- 

 aging more slender. 



Young much browner above than that of H. a. alicix, and with 

 chest more decidedly buffy. 



Adult male.— l^ength (skins), 151-167 (159); wing, 88.5-98 (92.1); 

 tail, 62-70.5 (66.5); exposed culmen, 13-13.5 (13.3); tarsus, 26-30 

 (28.5); middle toe, 15.5-17 (16.1).^ 



a With a much larger series of both this form and true E. alidse (twenty adults of 

 the former and more than fifty of the latter) than that examined by Mr. Brewster (see 

 Bull. Nutt. Orn. Club, viii, 1883, 16, 17), I find the average difference in coloration 

 to be very decided. 



b Ten specimens. 



