HYDROCHELIDON. 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. 



:!. Hungary, 12th June (T. Holland). Seebohm Coll. 



:!. Volga, liussia. Saunders Coll. 



2. S.E. Russia. Saunders Coll. 



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



Hydrochelidon hybrida (Pall.). 



Sterna hybrida, Thien. Fortpflanz. ges. Voq, tab. Ixxxv. fig. 1, a-^(184o- 

 54) ; Seebohm, Brit. Birds, iii. p. 260, pi. 49 (1835) ; id. Eggs oj 

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

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



Hydrochelidon hybrida, Baedeker, Eier Eur. Vog. tab. 32. fig. 1 (1855- 

 63) ; Saunders, Ibis, 1871, p. 399; Dresser, Birds Ear. viii. p. 315 

 (1877); Legge, Birds Ceyl. p. 996 (1880); North, Nests fy 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. Doiiana, Spain, 4th June (H. Seebohm Coll. 

 Saunders). 



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



7. San Lucar, Spain, June (H. S.}. Saunders Coll. 



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



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

 7. Seville, Spain, June (Ruiz). Seabohm Coll. 



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



4. LakeHalloula,Algeria(C/^.Zoc& 3 ). Salvin-Godman Coll. 



3. Dobrudscha (H. F. Moschlc.r). Seebohm Coll. 



I 1. Wullur 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. Andernon). Saunders Coll. 



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



Hydrochelidon nigra (Linn.). 



Sterna nigra, Thien. Fortpflanz. ges. Vog. tab. Ixxxv. fig. 5, a~f( 1845-54 ); 

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

 Brit. Birds, i'ii. p. 254, pi. 49 (1883) ; id. Eggs of Brit. Birds, p. 97, 

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



