ORIOLE BABBLER. 
282 
edging produces a scale-like appearance. The mid- 
dle of the body beneath, the edges of the wings, 
and the under wing-covers are bright yellow. Bill 
black ; legs pale. 
Total length, inches ; bill rather more than 1 ; 
wings, ; tail, 4 ; tarsus, 1 ; hind-toe and claw, T ? 3 . 
GREATER WHITE-CROWNED ROCK-THRUSH. 
Petrodncla leucoceps, Swains. 
Above brown ; beneath and lateral tail-feathers rufous ; front, 
crown, and nape, white ; the feathers with a narrow black- 
ish margin. 
White-crowned Thrush, Latli. Gen. Hist. v. 101. 
The Rock Thrushes, forming the genus Petrocincla, 
are the representatives of the stone-chat warblers in 
their own family circle ; and the analogy is so strong, 
that some recent authors have confounded the one 
with the other. Like the red-starts ( Pheenicura J, 
which they likewise represent, most of the species 
have rufous on their bodies and tail, with some 
portions of the head white ; the wings are always 
rounded, and not, like those of the true thrushes, 
pointed} the tail also is more or less graduated, 
w'hile in the genuine thrushes it is even. None of 
this genus have yet been found in America, al- 
though it is abundant in Africa and Asia. 
