BIRDS OF NORTH DAKOTA 27 



a nest with 3 eggs July 15, 1916. Only known records. Nest and eggs seen in 

 Turtle Mountains near Fish Hatchery and photographed on July 12, 1916. 

 Nest was in bank of a newly dug ditch resting on a small shelf, where side 

 of ditch had caved off. Eggs apparently about two-thirds incubated, nest 

 composed of small sticks, rootlets, bark and moss. 



229679. Mourning: Warbler. Geothylpis Philadelphia. 



Tolerably common migrant on prairies. One of the most common summer 

 residents of the Turtle Mountains. Their song, which is very clear and dis- 

 tinct, has three very distinct variations, all ending, however, in the same 

 manner, which is the distinguishing part. The bird is much oftener heard 

 than seen. While we knew them to be nesting all around us, a careful search 

 failed to reward us with a nest and eggs. A brood of young just from the 

 nest were seen in July. They were most commonly found in tracts that had 

 been cut over and were then growing up to sprouts and brush of all kinds. 

 Earliest arrivals from the south noted first week in June. 



230681. Maryland Yellow-throat Gfeothlypis trichas. 



Common summer resident of prairies and the Turtle Mountains. Breed- 

 ing. Earliest date of arrival in the spring May 3. 



231685. Wilson's Warbler. Sylyania pusilla. 



Rather rare migrant. Usually seen latter part of May. 



232687. Redstart. Setophaga omticilli. 



Common migrant of prairie and summer resident of Turtle Mountains, 

 Graham's Island and other wooded tracts. Arrives third week in May. 



233 697. American Pipit. Anthus pennsylvanicus. 



Regular migrant in spring. More common in the September movement 

 to the south. Not noted in the wooded regions. 



234700. Sprague's Pipit, Authus spraguli. 



Fairly common summer resident. This species was not noted for several 

 years, but after their song was learned I find them every year. Seldom seen 

 on the ground. I do not know when they come or go, but their song is not 

 heard until July. They are found near the low alkali flats or meadows. One 

 is able to locate them high in the air during the song season. They appar- 

 ently stay up for hours at a time. 



235704. Catbird. Galeoscoptes carolinensis. 



Tolerable common summer resident of this territory. First notes taken 

 third week in May for a number of years. 



236 705. Brown Thrasher. Harporhynchus rufus. 



Rather rare. Probably nest in Turtle Mountains as it is usually seen 

 during the breeding season. On the prairie they are an irregular migrant. 

 First spring notes running from May 13th to June 29th. 



237715. Rock Wren. Salpinctes obsoletus. 



But one known record. I took a specimen in spring of 1896. At the 

 height of a southeast storm it appeared around a woodpile in my yard ap- 

 parently blown out of usual haunts to the south by the high winds. 



238 721b. Aztec House W r ren. Troglodytes aedon aztecus. 



Very common summer resident of Turtle Mountains, nesting in hollow 

 trees and around the buildings of the settlers. More of a migratory bird on 

 the prairies, but now and then a pair finding a nesting site. Coming the 

 middle of May, they commence housekeeping soon after. 



239722. Winter Wren. Troglodytes hiemalis. 



Rare. Now and then one seen. May be more regular as a migrant than 

 I have noted. 



