THE BIRDS OF THE JUAN FERNANDEZ ISLANDS rs) 
Cerchneis sparverius fernandensis 
Chapman 
Native name: Cernicalo. 
Masatierra: 1 9 2"/i2 1916, 1 2 1%1,1 2 79/1 
IQt7. 
The two latter of these are probably 
young, and they display a very deep and satu- 
rated rufous of the upper parts, especially on 
the tail. The first is not so dark above (perhaps 
it is bleached because its plumage is rather 
worn), but its lower parts appear to be more 
washed with buff below and more broadly marked 
than C. s. cznnamominus from Chile. 
»Common on Masatierra, but entirely absent 
on Masafuera. It feeds almost exclusively on the 
very numerous spiders. Its absence from Ma- 
safuera is probably due to the lack of food 
there, i. e. the scarcity of large spiders and the 
almost complete absence of grashoppers, which 
constitute its main food on Masatierra.» (K. B.). 
Buteo erythronotus exsul Salvin 
Native name: Blindado. 
Masafuera: 1 6 juv., 1 @ semiad. 17/2; 1 & 
ad. 2%; 1 d juv. 7/2 1917. 

It is of interest to state on the present week Sit wee ce 
, roe : Fig. 3. Cerchneis sparvertus fer- 
adult female that SALVIN’s description (Ibis 1875,  xandensis,juv. Photo, K. Backstrom. 
p. 371) is quite correct, and that thus the diffe- 
rence from &. erythronotus King holds good. The narrow bars on the tail- 
feathers are, however, somewhat more numerous in this specimen, or about 
15 in number. Lenght of wing 433 mm. 
The young birds appear to be more vividly coloured, darker and more 
rufous than at least average specimens of &. erythronotus from Argentina. 
Evidently it takes more than one moult between the juvenile plumage and that 
of the adult. The two specimens termed above as »juv.» are on the way of 
assuming an intermediate plumage. Their worn tail-feathers are f. i. without 
the broad subapical band of the adult; the new ones, however, possess such 
one, at least on the outer web, but they are not yet white but silvery grey. 
The female termed »semiad.» is in moult to the adult plumage, the new 
tail-feathers being like those of the adult, and the plumage of the body mixed. 
»The buzzard, formerly said to be common on Masafuera, may now only 
amount to about 50 pairs. During the days of the penal settlement the con- 
