ERISMATURA. 193 



shape, but the larger end is somewhat pointed. They are pale 

 bluish white, the shell being granulated and rough in texture and 

 without any gloss. The two examples measure respectively : 2*47 

 by 1-83 ; 2-4 by 1-75. 



2. Jamaica. Crowley Bequest. 



Genus ERISMATURA, Bp. 

 Erismatura leucocephala {Scop.). 



Anas mersa, Thien. Fortpjlanz. ges. Viig. tab. Ixxx. fig. 4 (1845-54). 

 Erismatura leucocephala, Baedeker, Eier Eur. Vbg. tab. 23. fig. 5 (1855- 



63) ; Dresser, Birds Eur. vi. p. 677 (1878) ; Salvadori, Cat. Birds 



B. M. xxvii. p. 442 (1895) ; Sharpc, Hand-l. i. p. 227 (1899). 

 Erismatura mersa, Tristram, Ibis, I860, p. 163; Saunders, Ibis, 1871, 



p. 397. 

 Fuligula mersa, Bree, Birds Eur. iv. p. 159, pi. — (1867) ; 2nd ed. 



V. p. 123, pi. — (1876). 



The eggs of the White-headed Duck are either elliptical or of a 

 broad oval shape. The shell is thick and covered with coarse 

 granulations, and has little or no gloss. The eggs, when first laid, 

 appear to be of a pale bluish white, but with incubation they 

 become pale yellow or brown. They measure from 2-55 to 2-85 in 

 length, and from 1-9 to 2'05 in breadth. 



San Lucar, Spain {H. Saunders). Seebohm Coll. 



Dobrudscha. Seebohm Coll. 



Sarepta, South Russia. Seebohm Coll. 



R. Volga. Seebohm Coll. 



Kirghiz Steppes, July {Hencke). Seebohm Coll. 



Algeria. Seebohm Coll. 



Lake Halloula, Algeria, June Salvin-Godman Cull. 

 (Jif. B. Tristram). 



2. Lake Halloula, June (H. B. T.). Crowley Bequest. 



Erismatura jamaicensis (Gm.). 



Erismatura rubida, Scl. ^ Salv. Ibis, 1859, p. 232 ; Baird, Brewer ^- Ridgic. 



Water Birds N. Am. ii. p. 104 (1884). 

 Erismatura iamaicensis, Salvadori, Cat. Birds B.M. xxvii. p. 445 (1895) ; 



Sharpe, Hand-l. i. p. 227 (1899) ; Nehrk. Kat. Eiersamnd. p. 247 



(1899). 



The eggs of the Ruddy Duck are smaller than those of E. leuco- 

 cephala, but otherwise resemble them closely. They are, however, 

 less coarsely granulated. They measure from 2-35 to 2"55 in length 

 and from 1-75 to 1'9 in breadth. 



6. Duenas, Guatemala, 2Dd Juue Salvin-Godman Coll. 



(O. Salt- in). 

 2. Duenas, 2ud June (O. S..- Tristram Crowley Bequest. 



CoU.). 



VOL. ir. o 



