221 
to attach to this chararcter, existing as it does unsupported by other 
associative characters. With the very close resemblance which in 
other respects obtains between these Old and New World Muride, 
ought we to consider this one point as indicative of more than sub- 
generic difference ? 
The following are the groups into which the genus has been divided 
by Mr. Waterhouse, with the addition of one for the reception of 
the two species here described—H. latimanus and H. bicolor. 
A. Scapetromys, Waterh. Ex. Hesperomys tumidus, Waterh. 
B. Oxymyctorus, Waterh. Ex. H. nasutus, Waterh. 
C# Abrothriz, Waterh. Ex. H. longipilus, Waterh. 
D. Calomys, Waterh. Ex. H. bimaculatus & H. elegans, Waterh. 
E. Phyllotis, Waterh. Ex. H. darwinii, Waterh. 
F. Characterized thus :—Muzzle short and tumid ; ears small and 
naked, but not concealed by the fur ; feet short, broad and strong ; 
claws short ; tail as long as or longer than the body, nearly naked, 
but with more or less of a pencil of hairs at the tip, rather thin at 
the root, and tapering but slightly toa blunt point ; fur short, thick, 
soft, and without gloss. = Rips 1 Petit 
3. On THE BLack-SHOULDERED Peacock or LatHam (Pavo 
NIGRIPENNIS). By P. L. ScuaTer. i 
The species of the genus Pavo generally recognized by naturalists 
since the time of Linnzus have been two in number—the Common 
Peacock (Pavo cristatus) and the Javanese or Green Peacock (Pavo 
muticus). My present object is to call the attention of the Society 
to what seems to be a ¢hird distinct species, in some respects inter- 
mediate between these two, and which, though long since introduced 
into Europe and often bred in our aviaries, appears in some myste- 
rious manner to have almost escaped the notice of naturalists, and 
to have been left unprovided with a specific name up to this time. 
The bird I allude to is the Black-shouldered Peacock of Latham’s 
‘General History’ (vol. viii. p.114), where its differences from the true 
Pavo cristatus are accurately pointed out. They are, indeed, very 
obvious on comparison of either sex of these two birds, as may be 
seen by any one who will take the trouble to inspect the fine series 
of Pea-fowl belonging to C. Clifton, Esq., now under the Society’s 
care in the Regent’s Park Gardens. 
In the Black-shouldered Peacock of Latham (a term which I pro- 
ose to Latinize into Pavo nigripennis), the metallic green of the 
back, which forms the centre of the train, when expanded, is of a 
more golden hue than in P. cristatus, which it otherwise most gene- 
rally resembles. The whole of the secondaries, scapulars, and 
wing-coverts are black with outer narrow edgings of green, which 
becomes bluish towards the carpal joint. In this particular it re- 
