LOI'IIOTIIIORCFIIS KIENEIU. 273 



is shaded off, or blended into the adjoining greenish colour. 

 This distinction is alone conclusive. 



(2.) The bill is larger mid most conspicuously so when looked 

 at from below, the lower inaudible being longer and broader at 

 the base. The bill is both whiter below and paler brown above. 



(3.) The different shape of the end of the wing, the step 

 between 2nd and tip being much shorter iu viridanus. This 

 remark also applies to plumbeitarsus and lugubris. 



From plumbeitarsus its larger size, longer wing, only one 

 wing bar, paler tone and longer distance between 2nd and tip of 

 wing separate it. 



From lugubris its very much paler tone, smaller first or bas- 

 tard primary, and longer distance between 2nd and tip of wing 

 separate it. 



With an average lugubris, it could never be confounded, but 

 sometimes this species is much clearer and less dusky than 

 usual, in colour much resembling magnirostris, and then, if some- 

 what faded, it would not be unlike our new bird, save for the 

 other points noted. 



IflpltdriM'dus fkum. 



In Volume I, page 310, et seq, I gave a very full description 

 of the adult of this species, the Rufous-bellied Hawk-Eagle. 

 At page 9 of Vol. V.. while recording it from North-east 

 Cachar, I pointed out one great difference existing in apparent 

 adults of this species, viz., that, whereas some have the chin, 

 throat, and breast snow white, in others these parts are 

 strongly tinged and overlaid with the rich ferruginous 

 chestnut of the rest of the tower parts. At page 33 of 

 Vol VII., 1 recorded it from Southern Travancore — a locality 

 important because I had previously reason to doubt whether 

 the Peninsula species was really, as it proves to be, identical 

 with the Himalayan. 



Hitherto nothing has been said of the immature plumage 



of this species. In fact, so far as I know, only one youno- 



bird has ever been described, and that by Mr. Sharpe, in hia 



Addenda to Vol. 1. of his British Museum Catalogue, page 458. 



I find I have in my collection several young birds, one 

 considerably younger, and two again considerably older than 

 that described by Mr. Sharpe; and with these four and other 

 intermediate ones, we are now in a position to understand 

 fairly well the changes of plumage which this species under- 

 goes. 



