308 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



[Eremophila alpestris.] fi. leucolxma Ridgway, Orn. 40th Parallel, 1877, 498 



(w. Nevada, winter). 

 Eremophila alpestris leucolsema Ridgway, Nom. N. Am. Birds, 1881, no. 300a. — 



CouES, Check List, 2d ed., 1882, no. 83, i)art. — Nelson, Cruise "Cq,rwin," 



1881 (1883), 74 (St. Michael, Alaska). 

 E[remophila] a[lpestris] leucolxma Coues, Key N. Am. Birds, 2d ed., 1884, 282, 



part. 

 0\tocor\js'\ alpestris leucolsema Henshaw, Auk, i, July, 1884, 263 (diagnosis, etc.). 

 Otocoris alpestris leucolsema American Ornithologists' Union, Check List, 



1886, no. 474a.— Anthony, Auk, iii, 1886, 166 (Washington Co., Oregon, 



winter).— Turner, Contr. Nat. Hist. Alaska, 1886, 166 (near St. Michael).— 



Nelson, Nat. Hist. Coll. Alaska, 1887, 162 (St. Michael and upper Yukon).— 



Cooke, Bird Migr. Miss. Val., 1888, 156 (Dakota, Nebraska, Kansas, etc., in 



winter). — Dwight, Auk, vii, 1890, 142 (Monogr.). 

 0[tocons] alpestris leucolxma Ridgway, Man. N. Am. Birds, 1887, 348. 

 0\tocorys'\ a^lpestrisl leucolxma Covbs, Key N. Am. Birds, 5th ed., i, 1903, 507, part. 

 Otocorys leucolxma Sharpe, Cat. Birds Brit. Mus., xiii, 1890, 538 (Frenchmans 



R. and Three Buttes, Montana; Sun River and Black Hills, Dakota; Carson, 



Nevada; Walla Walla, Washington; British Columbia). 

 (?) Eremophila alpestris (not Alauda alpestris Linnaeus) Hartlaub, Journ. I'iir 



Orn., 1883, 274 (Dejiih and Portage Bay, Alaska). 

 Otocoris alpestris arcticola Oberholser, Proc. U. S. Nat. Mus., xxiv, June 9, 



1902, 816 (Fort Reliance, Yukon River, Northwest Territory; coll.U. S. Nat. 



Mus.). — American Ornithologists' Union Committee, Auk, xx, 1903, 



343 (check list no. 474a).— Osgood, North Am. Fauna, no. 24, 1904, 71 



(Portage Mts., Alaska).— Schalow, Vogel der Arktis, 1904, 240. 



OTOCORIS ALPESTRIS ENTHYMIA Oberholser. 

 SASKATCHEWAN HORNED LARK, 



Similar to 0. a. arcticola, but smaller and upper parts still paler, 

 and tliroat usually j^ellow or yellowish; similar also to 0. a. leucolsema 

 but upper parts slightly paler and grayer, superciliary stripe white 

 and (usually) paler yellow throat. Adult female similar to that of 

 0. a. arcticola but decidedly smaller and much paler, and throat 

 usually more or less tinged with yellow; similar also to that of 0. a. 

 leucolxma but grayer and slightly smaller. Young similar to that of 

 0. a. leucolsema but averaging slightly more graj^ish. (Intermediate, 

 except in size, between 0. a. arcticola and 0. a. leucolsema but nearer 

 the latter and perhaps not satisfactorily separable.) 



Adult male. --Length (skins), 157-168 (162) ; wing, 101-107.5 (104.8) ; 

 tail, 67-75 (70.4); exposed culmen, 10.5-12.5 (11.3); tarsus, 21-23 

 (21.8); middle toe, 11.5-13 (12.1).« 



Adult female.— Length, (skins), 149-153 (151) ; wing, 93.5-101 (97.6) ; 

 tail, 59-66 (62.5); exposed culmen, 9-11 (10.2) ; tarsus, 20-22 (21.2); 

 middle toe, 10.5-12 (11.5).« 



Breeding on the plains of south-central British America, in prov- 

 inces of Saskatchewan, Assiniboia, and probably western Manitoba; 

 migrating southward to Kansas and Colorado, occasionally to Utah 

 and Arizona. 



a Fifteen specimens. 



