On the Breeding-grounds of the Rosy Gull. 131 



& Hartert, Nov. Zool. viii. p. 187 (Kulambangra, Fauro, 

 Guadalcanal-) (1901), p. 377 (Guadalcanar) (1901), ix. 

 p. 588 (Isabel I.) (1902), xii. p. 254 (Rendova, New 

 Georgia, Bougainville) (1905). 



The females have the bills distinctly smaller than the 

 males (Rothsch. fy Hartert). 



Cacatua roseicapilla Vieill. ; Hartert, Nov. Zool. xii. 

 p. 212 (Alligator River) (1905). 



Licmetis Wagl. 

 I have met with no recent remarks on the two species 

 of this genus. 



Calopsittacus Less. 

 Calopsittacus Nov.E-HOLLANDiiE (Gm.); Sharpe, Hand- 

 list, ii. p. 11 (1900). 



Calopsitta novce-hollandia Dub. Syn. Av. i. p. 3 (1899) ; 

 Hartert, Nov. Zool. xii. p. 212 (Derby) (1905). 



[To be continued.] 



VIII. — The Breeding-grounds of the Rosy Gull. 

 By S. A. Buturlin. 



The Rosy Gull (Rhodostethia rosea) breeds quite commonly 

 in the Kolyma Delta (where I am now staying) and is 

 actually the most numerous member of the Order Gavia? 

 there during the summer, except the Black-capped Tern. 

 Up to the time of writing (June 23rd) I have collected 

 38 skins and 36 eggs of this pretty bird, though I have spared 

 large numbers of adults and their nests expressly to enable 

 me to acquire a sufficient quantity of the young in down 

 and of specimens in the immature plumage. 



The delta of the Kolyma, which is the easternmost of the 

 great rivers of the North Polar basin, lies, roughly speaking, 

 between 68^° and 69|° N. lat. and from 159° to 1611° E. long. 

 This vast area, at least 15,000 square kilometres in extent, 



k2 



