424 Mr. H. J. Elwes’ catalogue of the 
The evidence of the occurrence of this species in 
Sikkim is doubtful. I have two specimens from old 
collections marked Sikkim, and Moore’s types were 
supposed to be from there, but no recent specimens 
have been procured by Moller or myself. It seems rare 
also in the North-west, though Capt. Young finds it in 
Kulu. 
Note.—Since this was written, I have received, in 
January, 1887, but dated December, 1886, a copy of M. 
Oberthur’s ‘Etudes d’Entomologie,’ Liv. xi., in which 
Papilio Chentsong, from Yerkalo, in South-east Tibet, is 
figured. Three months later I received Messrs. Wood- 
Mason’s and de Nicéville’s paper on butterflies of Cachar 
from the ‘Journal of the Asiatic Society of Bengal’ for 
1886, pt. i., No. 4. This is dated 1887 on the cover. 
In it is figured Papilio Nevilli, from Cachar, described by 
Wood-Mason in the ‘Annals’ for 1882, p. 105. As far 
as I can judge from the plates, the two species are 
identical, though the different way in which the hind 
wings are expanded gives an apparent difference to the 
ficures. Wood-Mason says that Nevilli is nearly allied 
to Ravana. Oberthtr says that Chentsong is a geo- 
sraphical variety of the same. The principal, if not the 
only, difference between these forms and Ravana lies in 
the tails, which are said to be longer and less spathulate, 
though in these particulars I find some variation in 
Ravana, and in the absence of the pink spot on the end 
of the tail, which is sometimes present above and always 
below in Ravana. If the species is distinct, it must be 
known under the name of P. Nevilli, Wood-Mason, 
which has priority. 
398. Papilio plutonius. 
Papilio plutonius, Oberthur, Et. Ent. ii., p. 16, t. i., 
io. 2. . 
Of this species I have only two females in bad con- 
dition, brought by my native shikaris from the interior, 
perhaps from Bhotan, in 1884. They strongly resemble 
small dark females of the Japanese P, alcinous in all but 
their shorter spathulate tails, and are probably the 
females of a western form of this species; but, as Mr. 
Oberthur points out, are distinguished from the nearly- 
allied P. Lama, of which he figures the female, by their 
