Vol. xi.] 4 



fasciatis : pileo obscuro, marginibus plumarum plus 

 minusve lsete rufis. 



" Hab. sestiva incerta ; autumno hiemeque in provinciis 

 f Tomsk ' et ' Yeniseisk ' in Siberia centrali observatus, 



"This Jer-Falcon is quite new to science and has been 

 named by Prof. Menzbier in honour of Mr. Th. Lorenz, of 

 Moscow, a very able and active collector. Three specimens 

 have been obtained — a very old male, an adult female, and a 

 young bird. Two of them were procured in the Government 

 of Yeniseisk and the third in the neighbouring Government of 

 Tomsk. Unfortunately all were procured in winter, so that 

 we are as yet unaware of the breeding-range of this Jer- 

 Falcon. 



li This species is a very remarkable one, as it combines the 

 feature of the tarsal feathering of the H. saker group with 

 the barred plumage and bluish tints of the northern Jer- 

 Falcons. Its nearest relative is certainly H. milvipes, but 

 the replacement of so much of the peculiar brick-red colour 

 by a strong bluish tint distinguishes H. lorenzi at once. 



" Professor Menzbier sends the description of a new species 

 of Sea-Eagle which he proposes to call 



" Thalassaetus macrurus, n. sp. 



" Th. pelagico et Th. branickii haud dissimilis, sed cauda multo 



longiore ; culmine maxillae arcum circuli formante ; 



remigibus primariis quinque pogonio interno valde 



emarginatis, ut in Th. branickii; distantia autem inter 



apices secundariarum et primariarum duplo longiore. 



" Hab. ad urbem Yakutsk, in Siberia orientali. 



" This is a Sea-Eagle, belonging to the same group as 



Th. pelagicus and Th. branickii, with 14 tail-feathers. It 



can be distinguished from both its congeners by its very 



much longer tail (14*4 inches), which is graduated very 



regularly. The culmen of the bill forms an arc of a 



regular circle, as in Th. branickii, but the centre of this arc 



is situated further backwards, behind the vertical level of 



the nostril. Five primary- quills are sharply emarginated on 



their inner vane, as in Th. branickii, but the distance 



betw r een the tips of the innermost secondaries and the primary- 



