168 



FALCONID^. 



cc. Upper tail-coverts ashy brown like back, with 

 margins of pale greyish brown. 



Jackal jnv., p. 173, 

 del. Upper tail-coverts rufous. 



desei-tornm ad., p. 179. 

 f\ Under tail-coverts whitish or buff. 

 ee. Ear-coverts whitish like the head. 



fcrox ad., p. 176. 

 ff. Ear-coverts whitish, head brown. 



aa'. Centre of chest white, streaked with brown. 



vtilgaris ad., 186. 

 bV. Chest uniform white. 



desertorum j m\ .{capensis ), 

 p. 179. 

 ". Inner web of first primary white, with slight remains 

 of bars. 

 (/^. Ear-coverts and sides of face like head. 



(jg. Upper tail-coverts broadly tipped with white. 

 montaniis (calunis) ad., 

 p. 189. 

 lih. Upper tail-coverts not tipped with white, but 

 barred witli ochraeeous buff. 



?ia)-lani juv., p. 191. 

 /»". Ear-coverts whitish, head brown ; upper tail- 

 coverts uniform, not tipped with white. 



plumipes juv. {japo- 

 nicus), p. 180. 

 hP. Throat uniform brown or rufous brown. 



i". liiifous brown underneath, mottled with darker 

 brown and rufous . . montanus (calunis) ad., 



p. 189. 

 j". Underneath pale rufous, jackal ad., p. 173. 

 »'. Smaller wing-coverts conspicuously margined with rufous, forming a 

 slioulder-patch ; quills distinctly spotted with white externally ; tail 

 with from four to six alternate bars of black and pure white. 



lineatus ad., p. 191. 



III. Tail bluish grey, with from fourteen to seventeen distinct 

 cross bars on middle feather. 



erythronotus, p. 172; poliosomus, p. 171 ; galapagensis j\iy.,-p. 170. 



IV. Tail white, all the feathers narroioly barred across tvith blackish 

 and crossed loith a broad subterminal bar of the same. 



a. Under surface of body white. 



a'. Back slaty blue erythronotus S > P> 172. 



0'. Back rufous erythrmiotus 5 , p. 172. 



^. Under surface of body leaden grey poliosomus, p. 171. 



1. Buteo melanoleucus *. 



Aquila obscura y blanca, Azara, Apunt. i. p. 61 (1802). 



* " Why it should be called a ' Sea-Eagle' I do not know '' (W. B. Lee, Ibis, 

 1873, p. 13f)). Cf. also Sundevall, Av. Tent. p. 107 (1873). 



