332 LIFE HISTORIES OF NOKTH AMERICAN BIRDS. 



The eggs vary from three to six in lumiber. Sets of five are most often 

 found, and occasionally one may contain seven. Six is the. largest number 

 I have personally found. They are pure white in color and oval in shape, 

 and the shell is smooth, finely granulated, and rather glossy. 



The average measurement of one hundred and three specimens in the U. S. 

 National Museum collection is 40 by 321) millimetres, the largest egg meas- 

 uring 43.5 by 33.5, the smallest 37.5 by 31 millimetres. 



The type specimen. No. 20615 (PI. 12, P^ig. 2), selected from a set of five 

 eggs from the Bendire collection, was taken by me on March 16, 1882, near 

 Fort Walla Walla, Wa.shington. This is the earliest date on which I have 

 found eggs of this species; and incubation had already begun. 



113. Asio accipitrinus (Pallas). 



SHORT-EARED OWL. 



Strix accipitrina Pallas, Reise, Russischen Reiclis., i, 1771. 455. 

 Asio accipitrinus Newton and Yarrow, British Birds, ed. 4, i, 1872, 163. 



(B 53, C 321, R 390, C 473, U 3G7.) 



Geographical range : Entii-e western hemisphere, except Galapagos and part 

 of the West Indies ; also nearly throughout the eastern hemisphere, exceptinsj Aus- 

 tralia, etc. 



The breeding range of the Short-eared Owl within our borders extends, 

 as far as known at present, throughout the niiddU^ ])ortions of the United States 

 from about latitude 39° northward through the Dominion of Canada to the 

 Arctic regions, where Mr. R. MacFarlane met with it quite commonly in the 

 Anderson Ri\er country up to latitude 69°. 



On the Pacific coast it is known to l>reed from southern Oregon, in the 

 vicinity of Camp Harney, about latitude 42°, through Washington, Idaho, and 

 British Columbia to northern Alaska; and It is not improbable that it may 

 sometimes breed in California and Nevada. 



In the northern poi-tions of Its range it is only a summer visitor, migrating 

 south in winter. It is more than likely that it breeds, occasionally at least, in 

 suitable localities along the borders of the extensive marslies on the seacoast of 

 the South Atlantic States. By far the greater number of these birds, however, 

 breed north of our borders. 



In Its general habits, the Short-eared Owl diff'ers considerably from most of 

 the other members of this family found with us, in being not nearly so noctur- 

 nal and In frequenting the more open countrv; for while most of our Owls 

 inhabit timbered regions, this species shuns such sections and rarely even alights 

 on a tree. Its home is amidst the rank grasses or weeds usiuiUy found along the 

 borders of lakes and sloughs in the open prairie country, where it hides during 

 bright sunshiny days. If the sky is clouded, this Owl may be frequently seen 

 hunting in the early morning or evening and sometimes In the middle of the 

 day, and at such times It flies very low, not more than a few feet from the 



