LARIDiE. — LXIII. 151 



large; bill and feet dusky carmine; L. 16 to 19; W. 12 



to 13. U. S., coastwise. 



2. C. franklini, ( Rich. ) Bruch. Franklin's Rosy 

 Gull. Tarsus about as long as middle toe and claw; 

 bill and feet carmine; bill usually with a black mark; 

 medium; L. 14 to 16; W. 11. U. S., chiefly W. of the 

 Miss. R. 



3. C. Philadelphia, (Ord ) Lawr. Bonaparte's Gull. 

 Tarsus about as long as middle toe and claw; bill dark 

 or black, slender, tern -like; small; L. 12 to 14; W. 10. 

 N. Am., abundant. 



6. XEMA, Leach. Fork - Tailed Gulls. 



1. X. sabinai, (Sab.) Leach. Forked -Tail Gull. 

 Chiefly white, a black hood and collar; L. 14; W. 11. 

 Northern, S. in winter to N. Y. 



7. GELOCHELIDON, Brehm. Gull - Billed Terns. 



1. G. anglica, (Montagu ) Bon. Marsh Tern. Bill 

 black, very short and stout; L. 15; W. 12. E. U. S., 

 not abundant. 



8. THALASSEUS, Boie. Crested Terns. 



1. T. caspius, (Pallas ) Boie. Caspian Tern. Pri- 

 maries without white band; bill red; much the largest 

 of the Terns; L. 20 or more; W. 17; T. 6, not much 

 forked. Northern, S. in winter; scarce. 



2. T. regius, Gamb. Royal Tern. Bill orange; L. 

 18 or 20; W. 15; T. 8, deeply forked; much smaller than 

 the last but nearly as long. Atlantic Coast. 



3. T. cantiacus, (Gm.) Boie. Sandwich Tern. Bill 

 black, yellow at tip; I^. 16; W. 12 2^; T. 6. Europe and 

 Am.; rare on our coast. 



