ORDER LONGIPENNES. 23 
Genus STERNA LINN Us. 
SusBGENUS THALASSHEUS Bote. 
Thatasseus Bote, 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, 
pl. 13; He. 2: 
[B 682, C 561, R 680, C 793.] 
Geoc. Dist.— Nearly cosmopolitan ; in North America breeding 
southward to Virginia, Lake Michigan, Texas, Nevada, and Cali- 
fornia. 
SuscGENus ACTOCHELIDON Kaup. 
Actochelidon Kaur, Sk. Ent. Eur. Thierw. 1829, 31. Type, 
Sterna cantiaca GMEL. = SS. sandvicensis GMEL. 
65. Sterna maxima Bopp. 
Royal Tern. 
Sterna maxima Bopp. Tabl. P. E. 1783, 58. 
[B 683, C 562, R 681, C 794.] 
Geroc. 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 GamB. Pr. Ac. Nat. Sci. Phila. [V. 1848, 129. 
[B 684, C 563, R 682, C 795.] 
Geroc. Dist.— Pacific coast of America, from California to Chili. 
