9 [Vol. xi. 



corner of the mouth in A. ncevia never exceeds 2*15 inches, 

 while in A. hast at a it never falls short of 22 inches. 



"Finally, I wish to add a few words about A. fulvescens. 

 Up to the present I have examined twelve specimens of this 

 scarce bird, and have received from Russia a very detailed 

 description of one more. In this series, I believe, all 

 plumages of A. fulvescens have been represented, and I come 

 to the conclusion that A. fulvescens is a very well charac- 

 terized species. Its plastic characters are the same as in 

 A. clanga, but the changes due to age are quite different. 

 The bird gets darker with advanced age, and never assumes 

 longitudinal stripes or patches on the mantle, so charac- 

 teristic of young and immature A. clanga. The tone of the 

 coloration and its changes recall those of A. rapax to a 

 certain extent, and thus we are lead to consider A. fulvescens 

 as the ancestral form of A. clanga with the anatomical 

 characters of the latter, but still exhibiting many features of 

 its coloration in common with A. rapax. As concerns the 

 synonymy of A. fulvescens, I would state that the Eagle 

 described in the ' Journal fur Ornithologie ' for 1853 as 

 A. ncevia var. pallida is, judging from the figure, the young 

 of A. fulvescens ; but A. boeckii is only an aberration of 

 A. clanga, and I can find every possible step connecting it 

 with true A. clanga. But no intermediate forms exist between 

 so-called A. boeckii and A. fulvescens. I must add that the 

 so-called A. rapax from the Volga, preserved in the Museum 

 at Dresden, is really A. fulvescens*. 



" In summer A. fulvescens has been observed in Russia 

 only. Specimens were obtained in the Government of Tver. 

 The species is supposed to have been seen near Orenburg, 

 and it has been procured near Tomsk, and further eastwards 

 near Irkutsk and on the northern slopes of the Altai. On 

 migration this Eagle has been procured in Turkestan, on 

 the Lower Volga, in Eastern Germany, and, quite recently, 

 in Albania. Its winter-quarters are known only from 

 India. 



" In conclusion, I beg to draw the attention of all students 

 * [C'f. Hartert in new edition of ' Naumannia.' — R. B. S.] 



