230 THE RAPTORIAL BIRDS OF IOWA 



Surnia ulula caparoch (Muller). 



Say, Thomas, in Major S. H. Long's Account of an Expedition from 

 Pittsburgh to the Rocky Mts., 1819-20, p. 371. (Engineers Canton- 

 ment.) 



Coues, E., Birds of the Northwest, p. 312, 1874. 



Hatch, Dr. P. L., Birds of Minnesota, p. 219, 1892. 



Fisher, A. K., Hawks and Owls of the U. S., p. 187, 1893. 



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

 Trans. Acad. Sci., St. Louis, p. 113, 1907. 



Anderson, R. M., Birds of Iowa, p. 267, 1907. 



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. 177, 1910. 



Chapman, F. M., Birds of Eastern North America, p. 316, 1912. 



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

 U. S. Nat. Mus., p. 774, 1914. 



