GREATER WHITE-CROWNED ROCK-THRUSH. 283 
The present species is remarkable for its size, no 
less than for its conspicuous white crown. It might 
be at first mistaken for one of the mock-birds 
( Orpheus J, but its bill is that of a genuine thrush, 
i, e. short and notched. 
Although this is bj no means an uncommon bird 
at Senegal, its description only appeared in the last 
work of Dr. Latham, under the name of the White- 
crowned Thrush. It is clear, however, that more 
than one species is there spoken of; the smaller 
one being probably our next, which very much 
resembles this in its general colours. 
The size of our present species is equal to that of 
a small thrush, but the tail makes it appear longer. 
The whole top of the head, from the nostrils to even 
beyond the nape, is white ; each feather having a 
narrow blackish line on its margin, and another in 
the middle much stronger, but this latter can only 
be perceived when the feathers are raised. This 
white patch reaches, on each side, to the edge of 
the upper eye-lid, and is not, as in the next species, 
confined to a stripe in the middle of the crown. 
The ears, sides of the head, and neck, — the upper 
part of the back, the wings,' and the two middle 
tail-feathers, are all of a deep uniform brown ; and 
there is a small spot of the same colour, as Dr. La- 
tham well observes, at the tip of the chin. The 
whole of the under parts, as well as the rump, upper 
covers, and lateral tail-feathers, are of a deep buff 
or rufous orange. The outer tail-feather on each 
side has a narrow external margin of brown at its 
