hydeochblidon. 175 



from those of the Black Tern, described below. The specimens in 

 the Collection measure from 1-35 to 1'42 in length, and from "95 to 

 1'05 in breadth. 



3. Hungary, 12th June {T. Holland). Seebohm Coll. 



3. Volga, Russia. Saunders Coll. 



2. S.E. Russia. Saunders Coll. 



1. Southern Europe. R.. T. Frere, Esq. [P.]. 



Hydrochelidon hybrida (Pall.), 



Sterna hybrida, Thien. Fortpjlanz. ges. Vog. tab. Ixxxv. fig. 1, a-f (1815- 

 54) ; Seebohm, Brit. Birds, iii. p. 260, pi. 49 (1885) ; id. Eggs of 

 Brit. Birds, p. 98, pi. 29. figs. 8, 10 (1896) ; Oates ed. Hume, Nests 

 Sf Eggs Ind. B. iii. p 305 (1890). 



Hydrocheiidon hj'brida, Baedeker, Eier Eur. Vog. tab. 32. fig. 1 (1855- 

 63) ; Saunders, Ibis, 1871, p. 399 ; Dressei; Birds Eur. viii. p. 815 

 (1877) ; Legge, Birds Ceyl. p. 996 (1880) ; North, Nests ^ Eggs 

 Austr. Birds, pp. 353, 402 (1889) ; Irby, Orn. Str. Gibr. 2nd ed. 

 p. 292 (1895) ; Saunders, Cat. Birds B. M. xxv. p. 10 (1896) ; 

 Sharpe, Hand-l. i. p. 133 (1899). 



The eggs of the Whiskered Tern are generally of a regular oval 

 shape, and pyriform examples are comparatively few in number. 

 The ground varies from cream-colour to buff, and about half the 

 number of the specimens in the Collection are distinctly tinged with 

 green. The markings, which consist of spots and small blotches, are 

 of a reddish-brown or blackish-brown colour, and they cover about 

 one-quarter of the surface of the shell. The underlying markings 

 are dull grey or pale purplish brown. The eggs vary from 1-39 to 

 1-65 in length, and from 1-02 to 1-2 in breadth. 



3. Donana, Spain, 4th June [H. Seebohm Coll, 

 Saunders). 



6. Donana, 4th June {H. Saunders). Saunders Coll. 



7. San Lucar, Spain, June (Zi; (S.), Saunders Coll. 



2. South Spain. Lord Lilford [P.], 



2. Seville, Spain (L. H. Irby). Seebohm Coll. 

 7. Seville, Spain, June (Buiz). Seebohm Coll. 



3. Gibraltar, May (L. H. Irby). Seebohm Coll. 



4. LakeHalloula,AIgeria( CaptiocAe). Salvin-Godman Coll. 

 s! Dobrudscha {H. F. Moschlnr). Seebohm Coll. 



11. WuUur Lake, Kashmir, 8th June. Hume Coll. 



7. Kashmir. Hume Coll. 



4. Kashmir, 8th June ( W. E. Brooks). Hume Coll. 



4! Etawah, 14th Aug. (A. O. Hume). Hume Coll. 



3. Futtehgurh (A. Anderson),. Saunders Coll. 



3. Futtehgurh (A. A.). Saunders Coll. 



Hydrocheiidon nigra (Linn.). 



Sterna nigra, Thien. For^yflanz. ges. Vog. tab. Ixxxv. fig. 5, n-^ (1845-54); 

 Heimtson, Eggs of Brit. Birds, ii. p. 488, pi. cxxxv. (1856) ; Seebohm, 

 Brit. Birds, i'ii. p. 264, pi. 49 (1885) ; id. Eggs of Brit. Birds, p. 97, 

 * pi. 31. figs. 1, 3 (1896). 



