34 REVIEW OF AMERICAN BIRDS. [PART 
Among the species of Zurdus, of Dr. Sclater, I find in his section 
Semimerula a group which, in its characters, differs so widely from 
Turdus and Merula proper, that I cannot help considering it of 
generic rank. At one end of the section is Dr. Sclater’s type, 7. 
gigas of Eeuador, in which the wings differ most from Yurdus in 
being broad and much rounded; the Ist primary very large, and 
almost half the 2d, which about equals the 8th—the 6th quill longest. 
The bill is shaped like that of Z. migratorius, but rather larger. 
The legs are stout and strong. In 7. aurantius the wings are rather 
more pointed, but considerably less so than in 7. nugratorius. The 
lengthened tarsi, considerably longer than the head, form a conspicu- 
ous feature. The general appearance of aurantius is very like that 
of Mimocichla, the principal apparent difference being in the shorter 
and less rounded tail. The style of coloration, too, is much the 
same. 
Mr. George R. Gray places Cichlopsis, of Cabanis, among the 
Thrushes, with 7. aurantius as the type. The true type, however, 
is Turdus leucogenys, Licht. Berlin Mus., which is generically very 
different from the Turdus leucogenys, Latham (— 7. aurantius, Gr.). 
Semimerula aurantia. 
Turdus aurantius, Gu. Syst. Nat. I, 1788, 832.—Scrater, P. Z. 8. 1859, 
333.—Is. Catal. Am. Birds, 1861, 6, no. 37. (Semimerula.) 
Turdus leucogenys, LATHAM, Ind. Orn. I, 341.—GossE, Birds Jam. 1847, 
136.—Is. Illust. no. 23. 
Hab. Jamaica. 
The sexes do not appear to differ in this species, although the bills 
vary greatly in size. Thus in 24,340, %, the bill measures .60 from 
tip to nostril; while in 22,142, 2, it measures .75, with the same 
width at base or even rather narrower. Thus, as in other large 
Thrushes, I find that the bill varies considerably in size, although 
the average in a large number of specimens may furnish good specific 
characters. 
A young bird exhibits nothing of the spotted plumage of the im- 
mature North American Thrushes, differing from the adult merely in 
a wash of ferruginous on the under side, as well as on the top of 
head and back. 
Measurement of 24,340, 8: Length, 10.00; wing, 4.80; tail, 4.35; 
bill from head, 1.00, from nostril, .60, from gape, 1.20; Ist primary, 
1.10; 2d primary, 3.20; tarsus, 1.54; middle toe and claw, 1.28. 
