BIRDS OF MARSHALL COUNTY 



69 



Fig. 5. — Nest of Oven-bird (Sciurus aurocai)ilhis) containing Cowbird eggs. 



175. Oporornis Philadelphia. Mourning Warbler. A tolerably 

 common spring migrant from May 11 to May 24. Occasionally it 

 was common but more often one or two individuals were all that 

 could be found on a single trip. 



176. Geothlypis trie has trichas. Maryland Yellow-throat. An 

 abundant summer resident whose earliest arrival date was May 3 

 and which was last seen October 14. Although it was very abun- 

 dant in the breeding season the writer succeeded in finding only one 

 nest. This one containing four eggs was discovered July 14, 1915, 

 at Mormons Ridge. It was built in a densely matted field of red 

 clover and was about twelve inches from the ground. 



177. Wilsonia pusilla pusilla. Wilson's Warbler. A common 

 migrant from May 4 to May 22 and August 22 to September 26. 

 This species was present in abundance from May 17 to 21, 1913, 

 and was common again on May 22, 1915. In the fall it was usually 

 less in evidence. 



178. Wilsonia canadensis. Canada Warbler. The Canada 

 warbler was an uncommon spring migrant, being seen at that season 

 on only four dates. May 21 and 23, 1913, and May 22 and 23, 1914. 



