PLATE XVIII. 
ILLUSTRATIONS OF TWO SPECIES OF PAPILIO. 
Seen 
Tue two upper figures in this plate represent a butterfly de- 
scribed by Fabricius fifty years ago under the name of 
PAPILIO PELAUS, 
(Fabr. Ent. Syst. vol. iii. part 1, p. 5), but of which no figure has 
hitherto been published ; indeed the insect appears to be of the 
greatest scarcity, smce Godart and Boisduval are acquainted with 
it only from the Fabrician description; whilst from Fabricius 
having referred it to the Papilio torquatus of Cramer (Ins. 15, t. 177, 
fig. AB), with a mark of doubt, its rank as a species has been 
questioned*. Jam indebted to E. Doubleday, Esq. for an opportu- 
nity of figuring a specimen which accords with the Fabrician descrip- 
tion, except in having one white detached lunule near the anal angle 
above, and two beneath. There cannot, however, I think, be a 
doubt that it is the true Pelaus, and that it is abundantly distinct 
from P. torquatus. Mr. Doubleday is unfortunately unacquainted 
with the locality of his specimen. Fabricius says, ‘ Habitat in 
India,” but the habit of the species, as Boisduval suggests, is 
rather that of a New World—most probably South American or 
West Indian—species. 
The lower figure represents a new species, allied to P. Thymbrzeus, 
and especially to P. Perrhebus; for an opportunity of figuring 
which I am also indebted to Edward Doubleday, Esq., in whose col- 
lection it is unique. Being a native of Mexico, I propose to give it 
the name of 
PAPILIO MONTEZUMA, W. 
P. alis latis cyaneo-nigris, anticis punctis minutis marginalibus albis, posticis obtuse dentatis 
lunulis marginalibus albis, lunulisque sex submarginalibus maculaque ad angulum ani 
sanguineis. 
This species measures about four inches in the expansion of the 
wings, which are comparatively of great breadth; the fore pair 
having the apical margin’ slightly rounded and divided into slight 
scallops; the hind pair are obtusely dentate, the middle tooth being 
* P. Pelaus Herbst, (P. Peleides Esp., Boisduval,) is distinct, if indeed it really exist in 
nature, 
F 2 
