696 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Megascops asio mccallii (not Scops mccallii Cassin) Lloyd, Auk, iv, 1887, 190 

 (Tom Green and Concho counties, west-central Texas). — Hasbrouck, Auk, 

 X, 1893, 251, 254, part (geog. range).— (?) Stone, Proc, Ac. Nat. Sci. Phila., 

 1890, 128 (New Mexico). 



Megascops asio aikeni Brewster, Auk, viii, April (separates pub. Feb. 17), 1891, 

 139 (Colorado Springs, Colorado; coll. W. Brewster). — Bendire, Life Hist. 

 N. Am. Birds, i, 1892, 370 (Ft. Wingate, New Mexico; n. e. Arizona; etc.). — 

 Hasbrouck, Auk, x, 1893, 251, 258 (geog. range). — American Ornitholo- 

 gists' Union Committee, Auk, xi, 1894, 46; Check List, 2d ed., 1895, no. 

 373gf. — Cooke, Birds Col., 1897, 78 (range not clearly made out); Bull. 44, 

 Col. Agric. Exp. Sta., 1898, 161 (Colorado Springs in summer only). — Miller 

 (W. De W.), Bull. Am. Mus. N. H., xxii, 1906, 164 (Santuario and Rio Sestin, 

 n. w. Durango, breeding; crit.). 



3£[cgascops] asio aikeni Ridgway, Man. N. Am. Birds, 2d ed., 1896, 592. 



Olus a\sio'] aikeni Stone, Auk, xx, July, 1903, 275. 



Otus asio aikeni American Ornithologists' Union Committee, Auk, xxv, July, 

 1908, 372; Check List, 3d ed., 1910, 173.— Lacey, Auk, xxviii, 1911, 208 

 (Kerrville, w. Texas, common resident; habits, etc.). 



Scops aikeni Gurney, Cat. Birds of Prey, 1894, 38. 



[Scops'] aikeni Sharpe, Hand-list, i, 1899, 289. 



(?) Scops asio (not Strix asio Limia3us?) Cooke, Birds Col., 1897, 78 (Greeley and 

 Arkansas R. near Ft. Lyon, Colorado). 



[Scops asio] a. asio Ridgway, Proc. U. S. Nat. Mus., i, 1878. 106, 107, part (San 

 Pedro R., Arizona, Oct. 4.) 



Megascops asio trichopsis Mitchell, Auk, xv, 1898, 308 (San Miguel Co., New 

 Mexico, breeding up to timber line). 



OTUS ASIO MAXWELLIiE (Ridgway). 



ROCKY MOUNTAIN SCREECH OWL. 



Decidedly larger and very much paler than 0. a. ailceni; nearly as 

 large as 0. a. macfarlanei and 0. a. Jcennicottii, but conspicuously 

 lighter in color than any other form, with the white purer and more 

 extended and the colored parts paler; ground color above pale gray 

 or grayish brown, relieved by the usual ragged mesial streaks of 

 black and irregular mottlings and vermiculations of lighter and 

 darker shades of grayish, the general color more rufescent, and no 

 darker than very light ash gray or drab ; white spots on outer webs 

 of primaries frequently confluent along edge of quills, the darker 

 spots sometimes hardly visible on proximal portion when wings are 

 closed; under parts with pure white greatly predominating. 



Adult maZe.— Length (skins), 215-240 (227); wing, 161.3-174 

 (168.2); tail, 76.2-85.5 (82.8); culmen, from cere, 15-16 (15.3).'^ 



Adult female.— Length, (skins), 232-248 (238); wing, 167.6-181 

 (175.7); tail, 83.8-101.6 (88.6); culmen, from cere, 15.2-16 (15.4).^ 



Footliills and plains from eastern Montana (Fort Custer; Butte 

 County; Bridger Canyon, Gallatin County) and western South 

 Dakota (Swan Creek, Walworth County) through Wyoming (Black 



o Eight specimens. b Eleven specimens. 



