. 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. sabinei, (Sab.) Leach. FORKED -TAIL GULL. 

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

 Northern, S. in winter to N. Y. 



7. GELOCHELIDOH, 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. canfiacus, (Gm.) Boie. SANDWICH TERN. Bill 

 black, yellow at tip; L. 16; W. 12; T. 6. Europe and 

 Am.; rare on our coast. 



