P20 Mr. J. H. Gurney on additional Species of Birds 
powdery-grey appearance (as noticed by Prof. Schlegel), from 
which I have derived the name proposed for the species. It is 
undoubtedly very closely allied to T. griseicauda , and might well 
be treated as a slight geographical variety of that species; but 
in the present difficult genus, where forms very different in struc¬ 
ture are often deceptively alike in plumage, it seems advisable 
to define and name every constant form, especially where it 
possesses a distinct geographical habitat. 
Treron nasica, Schlegel. I have a male specimen of this 
curious bird from Sumatra, collected by myself. It agrees ex¬ 
actly with the description given, except that it is rather larger, 
instead of smaller, than the last-mentioned bird from Java. This 
will come in the subgenus Toria of Hodgson, agreeing with T. 
nipalensis in the frontal plumes advancing to the horny part of 
the bill. T. curvirostra, Gm., is probably a female or immature 
specimen of this bird. 
Treron fulyicollis, Wagl. I obtained both sexes of this 
species in Sumatra, which locality must be added to those men¬ 
tioned by Prof. Schlegel. 
Treron olax, Temm. Add Malacca as a locality for this 
species. 
Treron vernans, Gm. This species extends to Penang, from 
which island my specimen has the head dark slaty, and the lilac 
of the neck very narrow above. In the Macassar form the head 
is paler, the forehead and throat greenish, and the pale lilac of 
the neck is as broad above as beneath. A specimen from Borneo 
appears somewhat intermediate, though more nearly approach¬ 
ing that from Penang. More specimens from each locality are 
therefore required before we can determine whether these differ¬ 
ences are sufficiently constant to deserve specific appellations. 
XXVIII.— A Fifth additional List of Birds from Natal. 
By J. H. Gurney, M.P., F.Z.S.* * 
(Plates VIII. & IX.) 
The following species have (with one exception) been forwarded 
* See ‘Ibis,’ 1859,p. 234; 1860,p.203; 1861, p. 128; 1862, pp. 25,149. 
