E. LÖNNBERG, BIRDS FROM TRANSBAICALIA AND MONGOLIA. 39 



Archibuteo liemiptilopus Blyth. 



Borotji (f (n:o 14) ^"/o 1908. Tumutscheji d" (n:o 15) 7- 1008. Bura c^ 



(n:o 17) A 1908. 



Wing. Tail. Culmen (froin cere) 



N:o 14 487 mm. 287 mm. 40 mm. (26 mm.) 

 » 15 448 » 252 » 39 » (17 » ) 

 » 17 452 » 252 » 37,5 » (25 » ) 



The measurements of these birds are as foUows: 



The colour of the plumage of these specimens is rather 

 different. N:o 15, which I take to be the youngest, is at 

 the same time the darkest. Its general colour above is dark 

 brown with broad fulvous margins which on the wing-coverts 

 become rich rufous. The under parts fulvescent with broad 

 brown shaft-streaks, scattered on the breast, more densely 

 on the abdomen where they broaden to submarginal bands. 

 The lower flanks and the legs are dark brown with dull rufous 

 margins. The loAver tail-coverts are buffish white. 



N:o 14 is not quite so dark on the upper parts and the 

 margins of the feathers are paler and duller, from dull rufous 

 to buff. The under parts are buffish white with less spöts. 



N:o 17 is palest and its plumage is strongly bleached. 

 The general colour above buffish brown with the rufous 

 margins of the wing-coverts more richly coloured. The 

 lower parts are dirty whitish almost without spöts and the 

 lower flanks are påle rufous brown. 



Although the general appearance of these three speci- 

 mens is thus different, the pattern is the same, even if the 

 colours and shades differ. Especially characteristic is 

 the strong contrast between the dark colouration of the 

 legs continued on the lower flanks and the Hght colour of the 

 under parts in general. The pattern of the tail-feathers is 

 also the same in all with numerous dark bars across the 

 sometimes darker (brownish grey) sometimes lighter (greyish 

 white) web which always has a paler, of ten white, central 

 area around the white shaft. Very characteristic is also 

 the underside of the wing with a dark brown patcli at the 

 base of the primaries or at the outer edge of the wing formed 

 by the greater primary coverts in strong contrast to the 

 white web of the quills and the rufous or fulvescent proximal 

 great coverts and the fulvescent to buffish white smaller 

 coverts with their rufous shaft streaks. The dark ends of 



