Mr. R. B. Sharpe's Catalogue of Accipitres. 483 



gatus ) and the two species also differ in their markings and 

 coloration. 



I have lately remeasured ten specimens of A. stevensoni in 

 the Norwich Museum ; and although the dimensions of some 

 of them have been already given in ' The Ibis ' for 1863, I 

 think it convenient, for the purpose of comparison, here to 

 insert the following particulars : — 



Wing from Middle 



carpal joint. Tarsus. toe, s. u. 



in. in. in. 

 Presumed males : 



FromPekin 6-55 1-7 1 



From Macao 6-8 1-8 1-05 



Ascertained male : 



FromChefoo 6"65 1-8 id 



Presumed females : 



From China (exact locality un- 

 known) 7-7 1-9 1-2 



From Singapore 7-25 2 1-15 



Ascertained females : 



From Shanghai 77 2-05 1-2 



From Java 7"4 2 1-15 



The last-named specimen was obtained by the late Dr. 

 Bernstein, who appears, by the ticket which is attached to it, 

 to have recognized it as distinct from A. virgatus, of which 

 he also obtained specimens whilst resident in Java. 



I have not had an opportunity of examining this species in 

 the dress which it wears on first leaving the nest ; but the 

 specimen from Singapore above referred to retains some por- 

 tions of this plumage, showing that it is characterized by the 

 feathers of the breast exhibiting a long brown mark down 

 the centre of each feather, whilst the sides of the feather are 

 a pure white. As the bird advances in age these longitudinal 

 marks are exchanged throughout the breast, sides, abdomen, 

 and thighs for alternate transverse bars of pure white and 

 dark brown, the white bars being intersected on the upper 

 portion of the breast by dark shaft-marks; these are also 

 apparent on the throat, which, with that exception, is white. 



So far as I have observed, the female undergoes no further 

 change ; but in the male all these markings, except the nar- 



