306 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. IX. 



sloughs, wet marshes and lakes, but seldom found on Lake Michigan, 

 and probably only during migrations; arrives in Wisconsin, of an 

 average year, the first few days of May dates of arrival for a num- 

 ber of years at Lake Koshkonong range from April 16 to May n - 

 and departs early, few being seen after the middle of September. 

 When they arrive in the spring all are in the black, full breeding 

 plumage ; and all are in the white winter plumage before they leave ; 

 in fact, a great many begin to assume their winter plumage before 

 they are through nesting." (Birds of Wisconsin, 1903, p. 14.) 



30. Hydrochelidon leucoptera (MEISN. & SCHINZ). 

 WHITE-WINGED BLACK TERN. 



Distr.: Eastern hemisphere, accidental in North America (one 

 record, Wisconsin). 



Special characters, adult: Head, neck, and under parts, black; 

 upper parts, plumbeous; entire tail and upper and lower tail coverts, 

 white; anterior lesser wing coverts, white; legs and feet, red. 



Length, about 9; wing, about 8; bill, about .90. 



"The only known instance of the occurrence of this European 

 species on the Western Continent is that of a breeding female shot by 

 L. Kumlien in a large marsh near Black Hawk Island, Lake Kosh- 

 konong, July 5, 1873. The specimen was sent freshly skinned to Dr. 

 Brewer, and was presented by him to the National Museum." (Kum- 

 lien and Hollister, Birds of Wisconsin, Bull. Wisconsin Nat. Hist. 

 Soc., 1903, p. 14.) 



