ORDER LONGIPENNES. 23 



Genus STERNA Linnaeus. 



Subgenus THALASSEUS Boie. 



Thalasseus Boie, Isis, 1822, 563. Type, Sterna caspia Pall. = 

 S. tschegrava Lepech. 



64. Sterna tschegrava Lepech. 



Caspian Tern. 



Sterna tschegrava Lepech. Nov. Comm. Petrop. XIV. 1770,500, 

 pi. 13, fig. 2. 



[B 682, C 561, R 680, C 793.] 



Geog. Dist. — Nearly cosmopolitan ; in North America breeding 

 southward to Virginia, Lake Michigan, Texas, Nevada, and Cali- 

 fornia. 



Subgenus ACTOCHELIDON Kaup. 



Actochelidon Kaup, Sk. Ent. Eur. Thierw. 1829, 31. Type, 

 Sterna cantiaca Gmel. = S. sandvicensis Gmel. 



65. Sterna maxima Bodd. 



Royal Tern. 



Sterna maxima Bodd. Tabl. P. E. 1783, 58. 



[B683, €562, R681, C794.] 



Geog. Dist. — Tropical America, and warmer parts of North 

 America, casually northward to Massachusetts, the Great Lakes, and 

 California. West coast of Africa, north to Tangiers. 



66. Sterna elegans Gamb. 



£legant Tern. 



Sterna elegans Gamb. Pr. Ac. Nat. Sci. Phila. IV. 1848, 129. 

 [B 684, C 563, R 682, C 795.] 

 Geog. Dist. — Pacific coast of America, from California to ChiU. 



