PAPILIO. 537 
liill at 6000 feet at Rikisum in August. Moller has seen it on Birch Hill at 
7000 feet in July, and Mr. Knyvett has taken the very rare female on Sinchul 
in August. It seems, therefore, to be a single-brooded species, inhabiting 
the same zone of elevation as most of the peculiar Sikkim species do. The 
female, which has never been described, differs very markedly from the male 
in its pale whitish coloiir above." 
Distribution. Sikkim and Western China. 
Papilio philoxenus. 
Papilio pMloxemis, Gray, Zool. Misc. p. 32 (1831); Lep. Nepal, pi. ii. (18iG); West- 
wood, Cab. Orient. Eut. p. 81, pi. xl. fig. 2 (18i8). 
Papilio polyeuctes, Doubleday, Zool. Misc. p. 74 (184.2) ; Westwood, 1. c. pi. xl. fig. 3. 
Papilio lama, Oberthiir, Etud. d'Entom. ii. p. 15, pi. iii. fig. 1, $ (1870). 
Byasa philoxenus, Moore, Proc. Zool. Soc. Lond. 1882, p. 258. 
" Papilio alis anticis maris nigri.s, foeminae fuscis nigro longitiidinaliter striatis, posticis elongatis 
caudatis, valde sinuatis, macula magna oblonga alba versus angulum externum, puncto vol 
macula minori utrinque interdum adjecta, lunulis tribus rufis vel albo-rufis maculaque rufa 
ad apioem caudse strigaquc in pagioa infera, ex angulo anali rufis. 
" Papilio, with the fore -wings of the male black, the female brown with black longitudinal streaks 
between the veins, the hind wings more or less elongated, tailed, and deeply sinuated, with a 
large white sjwt near the outer angle, occasional!}- with a smaller spot on either side of it, 
and with three red or red and white lunules, a red spot at the extremity of the tail, and with 
a variable streak of red extending inwardly from the anal angle on the underside of hind 
wings. 
" Expansion of the fore wings 4| to 5| inches. 
" Inhabits Assam, Sylhet, Nepaul, &c. 
" Figure 2, which is drawn from the type specimen of P. philoxenus, has the tail but moderately 
broad, and the spots on the upperside of the hind wings are (except the large outer one) 
strongly marked with red. This is a native of Nepaul. 
" Figure 3 represents another insect from Sylhet, which 3Ir. E. Doubleday (Zool. Misc. p. 74) 
described under the name of P. polyeuctes, but which he now considers as a variety only of 
P. pihiloxenus. The posterior wings are very much elongated, and on the upperside the 
large white spot of the hind wings is not accompanied by the two small spots visible on 
either side of it on the under surface, nor is the red mark at the anal angle visible. 
Mr. Doubleday having represented the upperside of this supposed species in his work on the 
butterflies now in course of publication, the underside is here given, copied from a fio-ure 
communicated by Mr. Doubleday." ( Westwood, I. c.) 
Var. polyeuctes, Doubleday. " Male. Above : anterior wings black, deepest at base, striated in 
the discoidal cell and between the terminations of the nervures : posterior wings very much 
elongate, deeply dentate, with a rather spatulate tail : between the two posterior branches of 
the subcostal nervure, and close to the discoidal cell, is a large nearly quadrate white spot ; at 
4b 
