'909.] THE CAYUGA LAKE BASIN, X. Y. 445 



312 (654). Dendroica caerulescens (Gmelin). Black-throated blue 

 warbler. 



Common transient. It breeds regularly in small numbers on 

 South and Snyder hills. The average date of spring arrival is May 

 3, the earliest, April 29, 1905. Nesting continues through June and 

 the first half of July. The latest record in this connection is a nest, 

 found on August 11, which the young were just leaving. This spe- 

 cies is found in the fall until the middle of October. 



313 (655). Dendroica coronata (Linnaeus). Myrtle warbler. 

 Common transient. The average date of arrival in spring is 



April 22, the earliest, April 14, 1904. The migration of this species 

 ceases usually about May 15. After this date only a straggler is 

 seen. The latest record is May 21, 1904. The fall migration be- 

 gins the middle of September, becoming common about the first of 

 October. From the middle of this month they gradually diminish in 

 numbers finally disappearing about October 20. The latest fall 

 record is October 28, 1908. 



314(657). Dendroica magnolia (Wilson). Magnoha warbler. 



Common transient. A few breed regularly in the southern por- 

 tion of the basin. The average date of spring arrival is May 6, the 

 earliest, April 27, 1902. Migrants remain in the basin as late as May 

 30. On July 8, 1906, A. A. Allen found, on South Hill, a nest con- 

 taining eggs. The young left this nest on July 14. In the vicinity 

 of South Hill this species has been seen on the following dates : 1905, 

 June 4 ; 1906, June 7, July 30, August i ; 1907, July 22, two imma- 

 ture birds. On May 30, 1909, a nest containing two eggs was found 

 on the hills near Michigan Hollow in the southern portion of the 

 basin. 



315 (658). Dendroica caerulea (Wilson). Cerulean warbler. 

 Uncommon but regular transient. It breeds on Howland Island 



at the north end of the lake. The average date of spring arrival 

 is May 10, the earliest, May 2, 1902. 



316 (659). Dendroica pennsylvanica (Linnaeus). Chestnut-sided 

 warbler. 



Common transient and not uncommon summer resident. The 

 average date of arrival is May 18, the earliest. May 3-, 1905. Nests 



