484' Mr. H. Sauudcrs on the hniuatui'c 



row shaft-marks on the throat and some of the white trans- 

 verse bars on the abdomen, gradually disappear and leave the 

 entire remainder of the undersiirface of a fawn-colour, which, 

 however, is hardly so dark as is represented in pi. ii. of ' The 

 Ibis ' for 1863. 



The three remaining species of the gi'oup are A. rhodo- 

 gaster, A. sulaensis, and A. madagascariensis. The mea- 

 surements of the first of these, as given by Mr. Sharpe, ap- 

 pear to have been taken from a male bird ; and 1 may there- 

 fore mention that the detailed dimensions of two females are 

 given by Lord Walden at page 110 of the 8th volume of the 

 Zoological Society^s ' Transactions.' 



In the case of the nearly allied Accipiter sulaensis, Mr. 

 Sharpe gives the measurements of the type specimen, a fe- 

 male in the Ley den Museum, which I believe is the only 

 specimen of this Hawk at present existing in any European 

 collection. 



The specific name of madagascariensis , which has been long 

 used to denote Scelopizias francisccB, has been proved, by Mr. 

 Sharpens discovery of the type specimen in the British Mu- 

 seum, to be really applicable to the much scarcer Madagascar 

 Hawk which has hitherto been usually known by the name 

 of Accipiter lantzii, and which is fully described in Mr. 

 Sharpens volume under its prior appellation of madagas- 

 cariensis. 



[To be continued.] 



XLV. — Oil the Immature Plumage of Rhodostethia rosea. 

 By Howard Saunders, F.L.S., F.Z.S. 



When visiting the collection of Laridaj formed by the late 

 Herr Briich in the Museum of Mayence, I was already aware 

 that amongst its principal attractions were specimens of the 

 rare Cuneate-tailed Gull, Rhodostethia rosea, Macgill. Of 

 this interesting species all the examples hitherto examined 

 have been adults, and, with one exception, in summer plu- 

 mage, as marked by the black collai- ; my surprise and delight 



