88 



GsHUS I ■ ED K IB KM DON.— Outer tail feathers longest, pointed ; tarsus 

 very long : l>ill robust, Obtuse ; tail [est than half length of wing. 



til::. 6. anuli< a. Mont (G. macrotana, Gld.; Sterna anglica), Gull- 

 billed Tern (Long-leggi I Pi n). 

 Summer Plumage. Bead and hack of neck black. 

 Winter Plumage. Bead and back <>f neck white. 

 Total length, 15 in. : culmen, 1*8 to 2 in. ; wing, 12 to 13 in. ; 

 tail. 5*5 in.; depth of fork, 1 o in. ; middle toe and claw, 1 "25 in. 

 Hah. : 2, 3, 4, 6. 



Genus BYDROPROGNE. -Outer tail feathers longest; tarsus short; 

 tiii 1 vrr\ short, lest than one-third length of wing ; bill exceptionally 

 stout and deep. 



644. II. caspia. Pall. (Sylochelidon Btrenuns, Gld. ; Sterna caspia), 

 ( Saspian Tei n. 



Summer Plumage. Bead and back of neck black ; forehead, 

 crown, and nape glossy greenish-black ; grey above, white beneath ; 

 bill vermilion- red. 



Winter Plumage. Bead and back of neck white ; crown streaked 

 with white 



Young. — Back and tail mottled. 



Total length, 20 in. ; culmen, ."K* in. ; wine, 165 in. ; tail, 6 in. ; 

 depth of fork, 1*25 in. ; tarsus, 1*6 in.; middle toe and claw, 1*7 in. 

 (Individuals vary in size.) 

 Hah. : 1,2, 3, 4, .">. 



GKNU8 STERNA Outer tail feathers longest, pointed; tarsus short; 

 tail at least half Length of wing ; bill compressed and slender ; tarsus 

 never exceeds the middle toe with claw. 



64.~. S. 4 1 o 1 1 u ; 1 1 1 i . Mont. (S. nigrifrons, Masters; S. gracilis, Gld.), 

 ELoseab T< rn (( rracefti] Tern). 



I: -• kte tinge on white breast ; inner webs of primaries white to 

 the t ips : upper parts very pale grey; crown black in breeding 

 plumage ; forehead black to base of culmen. 



Total Length, 15'5 in.; wiir_'. 9*25 in. 



Bab. : 2, 3, 0. 



646. S. iiirilia. Hois. (Thalassens torresi, Gld.), Lesser Crested Tern 



Indian Tern). 



Kump and tail grey, Like the back; bill orange-yellow to red; 

 crown black in breeding plumage, and forehead black to base of 

 culmen. 



Total Length, 17 in. ; wing, 12 in. 

 II ib, I. 2, ::. I. 



647. S brruii. Licht, (Thalassens pelecanoides, King; T. poliocercus, 



Gld. ; T. cristatos, Blyth), Crested Tern B - its Tern). 



Grown black in breeding plumage; front of forehead white; Lores 

 white; bill greenish-yellow ; nape feathers Long; rump dark 

 like the mantle. 



Dotal Length, -<> in. ; wing, 1 1 in. 

 Bab. : I. 2, 3, \. 5, 6, 8 



s. frontalis. <;<>> (8. melanorhyncha, Gld.), White-fronted Tern 

 ithei ii Tern), 

 own I 'lack in breeding plumage; front of forehead white ; lores 



white ; bill I. lack 



Length, 16 tD 17 in. ; w nc_ r . 1 1 '-•"> in. 



Bab L, 2, 3, 4, 6, 8. 



