ORDER LONGIPENNES. 23 



GENUS STERNA LINNAEUS. 

 SUBGENUS THALASSBUS 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 ACTOCHBLIDON 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. 

 [B 683, C 562, R 681, C 794.] 



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 GAME. 



Elegant Tern. 

 Sterna elegans GAME. 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 Chili. 



