320 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. curvirosira, Gm., is probably a female or immature 

 specimen of this bird. 



Treron fulvicollis, 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. 



