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)^ but its bill is that of a genuine thrush, 

 i. e. short and notched. 



Although this is by 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, uppev 

 covers, and lateral tail-feathers, are of a deep but 

 or rufous orange. The outer tail-feather on each 

 side has a narrow external margin of brown at its 



