146 



NORTH AMERICAN FAUNA 73 



Trout Brook Road bridge at Hudson, St. Croix County. At that location, 

 Louisiana waterthrush has been recorded in the breeding season intermit- 

 tently since 1960. On 3 June 1974 I recorded singing males at four locations 

 along a 300-m reach of this stream. Returning on 5 June 1975, I located two 

 singing males and found one nest containing three eggs; their outcome is un- 

 known. 



Elsewhere, records from Washington County include one nest at Still- 

 water on 10 July 1943 (Chambers 1944) and a nest containing five young on 

 17 June 1945 (Lupient 1945). Roberts (1938) described the observation of a 

 nest and young along the St. Croix River below Taylor's Falls, Chisago 

 County, on 2-4 July 1927. Goddard (1972) reported this species during June 

 1971 along the Lower Kinnickinnic River, Pierce County. In the area near 

 the mouth of that river, two to three singing males have been recorded 

 yearly in June 1973-78, but no nest has been found. 



Habitat: Rich stands of Lowland Deciduous Forest along fast-moving 

 streams. The St. Croix County nest was located beneath an overhanging 

 root of American elm, less than 1 m from water's edge. 



Kentucky Warbler (Oporornis formosus) 

 Status: Casual, two records. 



Record: S. D. Robbins observed a male Kentucky warbler near Roberts, St. 

 Croix County, on 28 May 1963 (Faanes and Goddard 1976). This observation 

 represents the most northerly record of this warbler in Wisconsin. Glassel 

 (1977) described the observation of a singing male Kentucky warbler on 

 17 June 1977 at Afton State Park, Washington County. The bird remained 

 in the area at least until 19 June 1977. 



Connecticut Warbler {Oporornis agilis) 

 Status: Regular migrant and nesting species. 



Migration: Rare spring and uncommon fall migrant throughout the Valley. 

 Spring migrants arrive in the Western Upland 15-20 May (earliest— 4 May 

 1974, Pierce County), and reach the Northern Highland about 25 May. 

 During spring they are most frequently observed 25 May to 5 June and 

 depart by 10 June. Fall migrants arrive 15-20 August in the Northern High- 

 land and 20-25 August in the Western Upland. Peak fall migration occurs 

 5-15 September and they depart by 25 September. Roberts (1938) men- 

 tioned the observation of "several" Connecticut warblers in Pine County 

 during the first week of October 1929. 



Nesting Season Distribution: Rare and local during the nesting season. 

 Gromme (1941) described the only confirmed breeding of this warbler in the 

 Valley; a nest containing four young on 7 July 1941, near Gordon, Douglas 

 County (T. 43 N., R. 13 W.). Green and Janssen (1975) showed that the 

 nesting range of this warbler in Minnesota reached northern Pine County. 

 Breeding Bird Survey data (Table 6) suggest that a fairly large breeding 

 population exists in southern Douglas County (Sec. 11, 12, 13, 14, T. 43 N., 



