222 AVES: TUBINAKES. — XXXUl. 



CGI. S. paradisaea Hriinnich. AncTic Tern. Bill carmine 

 throu<;h()iit ; |ilniiia;xi' :is in Idntniln, hut darker below. L. 14 to 

 17. W. 1(1 to 11. 'r. 7 to 8. H. Ijj. Smaller than hirnndo, but 

 tail i)roportionally raueh longer. Aretie, S. to N. Y. (-fc-'u.) 

 eee. Outer tail-feather with both webs white. 



665. S. dougalli Montagu. Ro.skate Tehn. Bill black, usu- 

 ally orange at base below; mantle very pale; rosy-tinted below in 

 breeding season. L. 14 to 17. W. ;>^. T. o to «. B. 1^. Atlan- 

 tic coast. (A'h.) ('J'o Dr. McDougall, of Scotland.) 

 aa. AVing less than 7; tail deeply forked, about half wing. (Stemtda Boie.) 



6tJG. S. antillarum Lesson. Least Tkr.n. Bill yellow, usually 

 tipped with black ; a white frontal crescent lx!tween cap and bill ; 

 shafts of two or more outer primaries black above; mantle j)ale 

 gray; very small. L. 8 or 9. W. 6^. T. 3^. B. \\. E. L'. S., 

 chielly abundant coastwise. 



336. HYDROCHELIDON Bole. (CSwp, water ; ;^fXi8«i', swallow.) 

 ()(;7. H. nigra (L.). Black Tern. Head, neck and under parts 

 black (in full plumage) ; wings and tail above dark like the back ; 

 crissum white. L. 10. W. 8. '1.3^. B. l^V N. Am., chielly 

 inland. (A'u.) The American var. surinamensis (Gmelin) is 

 darker than the European form. 



FAMti.Y CXXIX. RHYNCHOPID^. (The Skimmers.) 



Gulls with the lower mandible much longer than the upper, com- 

 pressed like a knife-blade ; its two sides completely soldered to- 

 gether ; the upper edge as sharp as the lower, and fitting in a 

 groove in upper mandible; tip of bill obtuse; upper jaw com- 

 pressed, movable at base; tongue very short, stumin*. Wings very 

 long. ( )tlicrwisc similar to the terns. One genus, with 3 species. 



337. RHYNCHOPS Linna'us. (pwyxo^' beak; w^, face.) 

 GfiS. R. nigra L. Black Swim.mkr. Cutwater. Glossy 

 black; white below; lower mandible about an inch longer than 

 upper. L. 17 to 20. W. 15. T. 5, .sharply forked. B. 2^. 

 Troj)ical Amer., N. to N. J., abiuidant southward. 



Order XXXIII. TUniNAKKS. (The Tire-nosed 

 S\vimmi;ks.) 



Nostrils tubular; bill with the upper mandible hooked, its cover- 

 ing composetl of several [)icces separated by deep grooves. Other- 

 wise essentially like the Lotiyijnuncs so far as external characters 

 are concerned. 

 a. Nostrils united in a double tube, placed horizontally on tin- nilni'Mi. 



rKOCtLXJiHUU.K, 130. 



