nYDROCHELIDON. 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 

 l'U5 in breadth. 



;5, Hungary, 12th June [T. Holland). Seebohm Coll. 



3. Volga, liussia. Saunders Coll. 



2. S.E. Russia. Saunders Coll. 



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



Hydrochelidon hybrida {Fall.). 



Sterna hybrida, Thien. Fortpjlanz. ges. Voq. tab. l.\ssv. fig. 1, rt-/"(1813- 

 54); Seebohm, Brit. Birch, iii. p. 2'(i0, pi. 49 (18S5) ; id. Egqs of 

 Brit. Birds, p. 98, pi. 29. figs. 8, 10 (1890) ; Oates ed. Hume, Nests 

 4- Eyas Lid. B. iii. p 305 (1890). 



Hydrochelidon hybrida, Baedeker, Eier Eur. Vdg. tab. 32. fig. 1 (18oo- 

 03) ; Saunders, Ibis, 1871, p. 399; Dresser, Birds Eur. viii. p. 315 

 (1877); Legge, Birds Ceyl. p. 996 (1880); North, Nests 8f Eqqs 

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

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

 Sharps, 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 ])ale 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 (//. Seebohm Coll. 



Saunders). 



G. Donana, 4th June [H. Saunders). Saunders Coll. 



7. San Ijucar, Spain, June {H. S.). Saunders Coll. 



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



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

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



■ 3. Gibraltar, May (Z. H. Irby). Seebohm Coll. 



"■ 4. Lakenalloula,Algeria(6'«;^<.ZorA^), Salviu-Godman Coll. 



3. Dobrudscha {H. F. Miisehler). Seebohm Coll. 

 ] 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. Huine). Hume Coll. 



3. Futtehgurh {A. Anderson). Saunders Coll. 



3. Futtehgurh {A. A.). Saunders Coll. 



Hydrochelidon nigra {Linn.). 



Sterna nigra, Thien. Fortpjlanz. ges. Tog. tab. Ixxxv. fig. 5,ff-/'(1845-54); 

 Heu'itson, Eggs of Brit. Birds, ii. p. 488, pi. csxxv. (18.56) : Seebohm, 

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

 pi. 31. figs. 1, 3 (1890). 



