SWAINSON'S HAWK. 241 



with different shades of brown, such as burnt umber, liver brown, hazel, and 

 tawny, and of clay color, French gray, and drab gray. With but very few 

 exceptions none of the eggs are heavily marked; about one-half are, however, 

 moderately well spotted. 



The average size of one hundred and sixty-six specimens in the U. S. 

 National Museum collection is 56.5 by 44 millimetres. The largest egg of 

 the series, one taken by myself at Fort Lapwai, Idaho, measures 62 by 46.5 

 millimetres, the smallest, taken by Lievit. H. C. Benson, at Fort Huachuca, 

 Arizona, measures but 50.5 by 40.5 milhmetres. As is usually the case, the 

 eggs from the northern breeding ranges average larger in size than those from 

 the southern. 



The type specimens selected to show the principal variations found in 

 these eggs are: No. 20713 (PI. 8, Fig. 1), from a set of two taken near Camp 

 Harney, Oregon, May 12, 1875; No. 20733 (PI. 8, Fig. 2), a very pecuharly 

 marked egg from a set of four, taken near Fort Lapwai, Idaho, May 28, 1871 ; 

 No. 20740 (PI. 8, Fig. 3), a single egg, and very distinctly marked, was taken 

 near the Umatilla Indian Agency, Oregon, May 28, 1882; these are from the 

 Beudire collection. No. 23139, two eggs from same set, very handsomely 

 marked (PI. 8, Figs. 4 and 5), taken near Fort Huachuca, Arizona, May 27, 

 1887, and No. 23150 (PL 8, Fig. 6), from the same locality, taken June 18, 

 1887, were collected by Lieut. H. C. Benson, Fourth Cavalry, U. S. Army, 

 who made an exceedingly interesting collection of both birds and eggs of that 

 then slightly explored region; and he generously presented them all to the 

 U. S. National Museum. 



82. Buteo latissimus (Wilson). 



BROAD-WINGED HAWK. 



Falco latissimus Wilson, American Ornitliology, vi, 1813, 92, PI. 54, Fig. 1. 

 Buteo latissimus Sharpe, Catalogue of Birds in British Museum, i, Accip., 1874, 193. 

 (B 27, C 355, R 443, C 524, U 343.) 



Geographical range: Eastern North America; north to New Brunswick and 

 Saskatchewan; west to edge of Great Plains; south (in winter only ?) through Central 

 America and West Indies to northern South America. 



The breeding range of the Broad-winged Hawk includes the whole of 

 the eastern United States, from the Mississippi River to the Atlantic Ocean. 

 West of the Mississippi Nehrling found it breeding near Houston, in eastern 

 Texas. Col. N. S. Goss gives it as rare in Kansas, but probably breeding, 

 and it is known to be common in portions of Iowa and Minnesota. It ranges 

 beyond our border into southern Canada, and breeds from Nova Scotia and 

 New Brunswick west to the province of Assiniboia and north to the Saskatch- 

 ewan plains. 



In Florida, South Carolina, and the Gulf coast generally, it seems to be 

 a rare resident, but it has been reported as breeding near Lake Harney, 

 26957— Bull. 1 16 



