Lepidoptera of Sikkim. 423 
fold of the hind wing in the male, but this cannot be 
examined unless it is completely expanded. 
396. Papilio aidoneus. 
Papilio aidoneus, Doubl., Ann. Nat. Hist., xvi., p. 178, 
(1845), 3. 
Papilio erioleuca, Oberthir, Et. Ent., iv., p. 33, t. iii, 
1879, 3. 
? Papilio erioleuca, de Nicéville, J. A. 8. B., 1883, ii., 
p. 98. 
This species is not uncommon in Sikkim at 2—3000 ft. 
from April to November, and the females, as pointed out 
by Mr. de Nicéville, are easily distinguished from those 
of astorion by their larger size, different ground-colour, 
and colour and size of the abdomen. Col. Lang was 
right, I think, in attributing the species to aidoneus, as 
a specimen so named, which is probably the type of 
aidoneus, exists in the British Museum, and is identical 
with the Sikkim insect here spoken of. 
The males are easily distinguished from those of 
astorion by the very differently-shaped fold of the hind 
wing, and the longer and narrower shape of tbat wing, 
which has a cell shorter in proportion than is the case 
in P. astorion. 
I have seen the type of erioleuca, Oberthur, and have 
no doubt whatever that it is simply the male of aidoneus 
with the anal fold of the hind wing opened out so as to 
show the curious pink-and-white patch of scales which 
are concealed beneath it. I can see no difference what- 
ever between this and several males of aidoneus in 
my collection. The length of the cell on the hind wing 
of this species, which is shorter than in astorion, and 
the narrower wings, enable one to distinguish the species 
even when the hind wings are folded. 
397. Papilio Ravana. 
Papilio Ravana, Moore, Cat. Lep. E. I. C., i., p. 96 
(1857), no description. 
Papilio Philoxenus, var., Westw., Cat. Or. Ent., t. 40, 
fig. 4. 
Papilio Philoxenus, var. B, Gray, Cat. Lep. B. M., 
Bleek Dai 
