228 THE RAPTORIAL BIRDS OF IOWA 



* Anderson, R. M., Birds of Wiilnebago and Hancock Counties, Iowa, p. 



9, 1897. (Buffalo Center.) 

 *Keyes, Charles Reuben, The lowan Raptores: The Iowa Ornithologist, 



Vol. 3, No. 2, p. 20, April, 1897. 



Bailey, B. H., Two Hundred Wild Birds of Iowa, p. 62, 1906. 

 Woodruff, F. M., Birds of the Chicago Area, p. 106, 1907. 

 Anderson, R. M., Birds of Iowa, p. 266, 1907. 

 Widmann, Otto, A Preliminary Catalogue of the Birds of Missouri: 



Trans. Acad. Sci., St. Louis, pp. 112, 113, 1907. 

 Cory, C. B., Birds of Illinois and Wisconsin, p. 497, 1909. 

 Bruner, L., Wolcott, R. H., Swenk, M. H., A Preliminary Review of the 



Birds of Nebraska, p. 56, 1909. 

 A. O. U. Check-List, p. 176, 1910. 

 Bunker, C. D., The Birds of Kansas, p. 148, 1913. 

 Chapman, F. M., Birds of Eastern North America, p. 315, 1912. 

 fTinker, A. D., Notes on the Ornithology of Clay and Palo Alto Counties, 



Iowa: Auk, XXXI, pp. 70-81, 1914. 

 Ridgway, R., Birds of North and Middle America, Part VI, Bull. 50, 



U. S. Nat. Mus., p. 768, 1914. 

 Fenton, Carroll Lane, Preliminary List of the Birds of Floyd County, 



Iowa: Wilson Bulletin, XXVIII, pp. 130, 138, 1916. 



Genus Surnia Dumeril. 



32. SURNIA ULULA CAPAROCH (Muller). 377a. 

 Hawk Owl. 



Field Characters. A medium sized, hawklike, grayish brown owl, 

 with long rounded tail ; to be seen hunting in the day-time. 



Description. Above, grayish brown; head and neck spotted, and 

 back barred with white; tail long, rounded, and indistinctly white- 

 barred, the central feathers considerably longer than the lateral ones. 

 Below, with dusky streaks on sides of neck and upper breast ; throat 

 with dusky spot, the remainder of the under parts barred with red- 

 dish brown. Feet and toes completely feathered. 



Measurements. Length, 14.75 to 17 inches; wing, 8 to 9 inches; 

 tail, 7. to 7.25 inches. 



Range. Northern North America, breeding generally north of 

 the United States. South in winter to Nebraska, Iowa, Indiana, 

 Ohio, etc. 



