542 PAPILIOXID.E. 
ornees de taches rouges semecs de noir. Ces taches, situees dans I'entre-deux des nervures et 
pres du hord exterieur, sont lunulees ; celle qui est plus pres de Tangle anal est plus chargee 
de rouge ; les deux suivantes sont encore assez rouges; mais les trois dernieres paraissent 
rouges presque uniquement par la transparence du dessous. Ces lunulcs sont au milieu 
d'une macule triangulaire qui ressort plus noire sur le fond de I'ailc. 
" Lo dessous reproduit le dessus, mais est d'un ton plus pale et plus mat. Les taches rouges de I'aile 
iuferieure ne sont pas saupoudre'cs de noir, et il y a en plus de celles du dessus uue grosse 
tache rouge pres de la poche analc ; cette taehe transparait cependant un peu en dessus. 
"La femelle differe du male parce que la poche est remplacee par un renflement et parce que la 
couleur des ailes est d'un brun plus pale, cuivreux, au lieu d'etre noir." (ObertJiiu; I. c.) 
This species seems to combine the characters of both P. alcinous and some 
of the aberrant forms of P. jjhiloxenus. From P. alcinous it may be separated 
by the greenish-cupreous sheen of the upper surface of the male and in both 
sexes by the more irregular outline of the secondaries and more spatulate 
tails ; the under surface of all the wings is olivaceous brown, thus causing 
the neuration of secondaries to appear more prominent. The female more 
nearly resembles the same sex of P. alcinous. 
In both sexes the secondaries have the appearance of being semitransparent, 
and this will serve to at once separate P. plufonius from any form of P. alcinous. 
From dark forms of P. philoxemis this species can easUy be separated by 
the number and arrangement of submarginal lunules on the under surface of 
the secondaries ; these in P. plutonim are seven in number, instead of five, 
and are placed in a regular series nearer to the margin of the wing than in 
P. philoxenus ; there is never any trace of a red spot on the tail or on the 
lobe at end of second median nervule, and the spot beyond discoidal cell is 
not white. 
Although the red submarginal lunules are always constant on the under 
surface they vary in definition on the upper surface, and in one example are 
reduced in number to one spot at anal angle. 
Appears to be common and generally distributed in Western China. 
In his " Catalogue of the Lepidoptera of Sikkim " (Trans. Ent. Soc. Loud. 
1888), Mr. Elwes, referring to P. plutonius, says : — 
" Of this species I have only two females in bad condition, 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." 
Listrihution. Western China, Bhotan. 
