1909.] THE CAYUGA LAKE BASIN, N. Y. 411 



XXIV. Order LONGIPENNES. The Long-winged Swimmers. 

 40. Family LariDyE. The Gulls and Terns. 



108 (40). Rissa tridactyla (Linnaeus). Kittiwake. 



A specimen was reported by William Hopkins in 1854. 



109 (43). Larus leucopterus Faber. Iceland gull. 



A specimen was taken on Cayuga Lake by L. A. Fuertes during 

 the winter of 1896-7 and another was brought in by a fisherman 

 March 17, 1897. 



110(51). Larus argentatus Pontoppidan. Herring gull. 



Common winter resident. It is abundant during the spring and 

 fall. They appear in the fall the first of September and leave in 

 the spring about May 25 the latest record being June 2, 1906. 



111 (54). Larus delawarensis Ord. Ring-billed gull. 



Foster Parker, of Cayuga, has a specimen taken on the lake a few 

 years ago. 



112 (60). Larus Philadelphia (Ord). Bonaparte's gull. 

 Transient. Common in spring, rare in fall. It is found in the 



spring from April 20 to May 25 and is usually common during that 

 period. On June 14, 1908, a flock of eleven individuals was reported 

 at the south end of the lake and on July 24 of the same year L. A. 

 Fuertes reported a single individual from Cayuga at the north end of 

 the lake. In the fall this species is found occasionally in October 

 and November. 



113 (62). Xema sabinei (Sabine). Fork-tailed gull. 



One specimen taken at the north end of the lake about 1887 by 

 Foster Parker. It is now in the collection of E. H. Eaton. 



114 (70). Sterna hirundo Linnaeus. Common tern. 



Regular, though not common, transient through May and the 

 first of June. Mr. L. A. Fuertes reports a specimen the latter part 

 of April 1898 and two adults near the mouth of Fall Creek at Ithaca, 

 July 6, 1908. The only fall record of this species is a single indi- 

 vidual reported by L. A. Fuertes the last of August, 1907. 



