OF THE MALAYAN REGION. 41 
Remarks.—I have been in much doubt about the position of this remarkable species, 
and was for some time inclined to place it among the Papilios. It agrees, however, far 
better with Ornithoptera in the form and stoutness of the wings, the long stout and 
curved antennæ, the red collar and patches at the base of the wings beneath, the abdo- 
minal fold, and the flight and general appearance. It is powerful on the wing, and 
occasionally settles on the ground in damp sunny places. It inhabits the interior of 
North-west Borneo and the mountains of West Sumatra. The female is unknown. It 
is peculiar in the great length of the discoidal cell of the wings and its altogether 
unique style of coloration, and must be considered as the type of a distinet group of 
the genus Ornithoptera. 
PAPILIO. 
This is without doubt the finest and most remarkable genus of Diurnal Lepidoptera. 
About 360 species are now known, all, except ten, being tropical or subtropical. I have 
given at p. 23 the characters of the sections and groups into which I divide the Ma- 
layan species. 
SECTION A. 
a. Nox group. 
17. ParıLıo Nox, Swainson. 
P. Nox, Sw. Zool. Ill. pl. 102; Horsf. Lep. Ins. E. I. C. pl. 1. £. 1; Boisd. Sp. Gen. Lép. p. 277. 
P. Neesius, Zink. Nov. Act. Acad. Nat. Cur. xv. t. 14. f. 1. 
Hab. Java (d , 9) (Wall.), Penang (d) (Brit. Mus.). 
18. PaAPrLIO Nocris, Hewitson. Tab. V. fig. 1 (3)*. 
P. Noctis, Hewits. Proc. Zool. Soc. 1859, p. 423, pl. 66. £. 5 (9). 
Male: differs from the same sex of P. Nox by the broader apex of the fore wings, and 
by the hind wings being more elongate, more glossy, and especially by the entire non- 
dentated hinder margin. 
Hab. Borneo (Sarawak) (Wall.), (3, 9 Mus. nost.) 
19. PAPrLIOo EnrBus, Wallace. 
P. Nox, var., De Haan, Verh. Nat. Gesch. t. 5. f. 3 (2). 
Hab. Malacca (Wall.), Banjermassing, Borneo (De Haan). 
Remarks.—I am somewhat doubtful of the species, the female only being known ; but 
it differs so strikingly from the same sex of P. Nox and P. Noctis (the former of which 
seems very constant), that I think it better to separate it in order to draw attention to 
other specimens that may exist in collections. It differs from P. Nox (?) by its narrower 
and more elongate hind wings, which are black, glossed with steel-blue; the fore wings 
are black, with the veins beyond the cell clearly white-margined. The lower margin is 
also much less strongly dentated. 
* In all the Plates, the wings on one side of each figure are detached from the body, and represent the under surface 
of the same insect. In one case only (Tab. VII. f.1.) the upper surfaces of two varieties of the same species are given. 
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