Mas-afuera and Juan Fernandez. 371 



allied E. fernandensis is quite definable. The male is hardly 

 distinguishable from J5J. fernandensis; but, besides being a 

 little larger, the bright colour of the crown extends 

 further back towards the nape. The female differs in the 

 colouring of the rectrices. All of these except the median 

 pair in E. fernandensis are white on their inner webs, whereas 

 in E. leyboldi the white on this portion of the feather is re- 

 stricted to the tip and a narrow margin of the inner edge. 



In Mr. Sclater^s paper a Buzzard is included as an inhabi- 

 tant of Mas-afuera under the name of B. erythronotus . His 

 authority for so doing rested upon a skin of an immature bird 

 in our collection. Mr. Barclay^s series contains adults of 

 this bird, which show that it differs specifically from the con- 

 tinental B. erythronotus ; and for it I now propose the name 



BUTEO EXSUL. 



Buteo erythronotus, Scl. Ibis, 1871, p. 182 (nee D'Orb.). 

 ^ supra obscure schistaceus ; genis paulo pallidioribus ; hu- 

 meris et interscapularibus albo stricte marginatis ; alis 

 nigris plumbeo obsolete transfasciatis, secundariorum 

 apicibus albis ; subtiis pure albus, abdomine fasciis an- 

 gustis fere obsoletis notato ; subalaribus albis plumbeo- 

 nigro sparse fasciolatis, axillaribus plumbeo-nigris, 

 exterioribus albo transfasciatis : alis intiis albis griseo 

 vermiculatis, in secundariis quasi fasciatis ; supra- 

 caudalibus lateralibus albis; cauda alba, fasciis decem 

 angustis et una lata subapicali nigris notata ; rostro et 

 unguibus corneis, cera et pedibus flavis : long, tota cir. 

 20 poll., alse 15, caudae 8, tarsi 3'5. 

 ? mari similis sed major. Long, tot 24 poll., alae 17, 

 caudse 9, tarsi 3'8. 

 Hab. in insula Chiliana " Mas-afuera " dicta. 

 Obs. Species distincta ; Buteoni erythronoto similis, sed co- 

 loribus suprk obscurioribus, plumis interscapularibus albo 

 marginatis, genis obscuris nee striatis, dignoscenda; femina 

 interscapulio ei maris simili nee rufo distinguenda. 



This Buzzard has its nearest ally in B. erythronotus, but, 

 as already stated, may in its adult state be at once distin- 

 guished from that species by the darker slaty grey colour of 

 its upper plumage, and also by the female having the back 

 uniformly coloured, just as in the male, the female of B. ery- 



2 D 2 



