BUTTEEFLIES. 173 



extremely rare in Sikhim, as the butterfly it mimics does not occur 

 there, the second form is tlie commonest of the three. 



482. Papilio (Orpheides) erichthonius, Cramer. 



A butterfly of the plains, found only at low elevations sparingly. 

 Mr. Dudgeon has found its larva at 1,500 feet feeding on wild citron. 



483. Papilio (Menamopsis) slateri, Hewitson. 



A single-brooded species, which flies in April and May in the 

 low outer valleys only. It is common at Sivoke. 



484. Papilio (MenamoiDsis) epycides, Hewitson, 



Also single-brooded, occurring in April and May at low eleva- 

 tions, especially at Sivoke. It a^ipears to be very local, but is 

 not rare where found in river-beds at 1,000 feet. It occurs also in 

 Bhutan, the Khasi Hills, and Upper Burmah ; also in Western China. 



485. Papilio (Chilasa) clytia, Linnajus. 



Occurs from March to November commonly at low elevations. 



486. Papilio (Chilasa) panope, Linnaeus. 



Found with P. clytia, Linna3us, at the same elevations and seasons. 

 I have no doubt that these two species are really one species, which 

 is dimorphic in both sexes ; but as this theory has never been proved, 

 I have kept them distinct. Mr. Dudgeon has noticed the two species 

 flying together, but has not succeeded in taking the opposite sexes 

 in copula. 



487. Papilio (Paranticopsis) megaeus, Westwood. 



Mr. Elwes records this species from Sikhim on the strength of 

 an old specimen so labelled. Its occurrence there is more tlian 

 doubtful. It is found not uncommonly in the Khasi Hills and south- 

 wards. 



488. Papilio (Paranticopsis) xenocles, Doubleday. 



Flics in Sikhim from April to November from the level of the 

 Terai up to about 3,000 feet. The males arc fairly common, the 

 females, as usual in the genus, are very rare. 



489. Papilio (Paranticopsis) macareus, Godart. 

 Single-brooded and rather rare in Sikhim, occurs in the low outer 



valleys only from April to June. The Sumatran form has been 

 described as P. macareus, var. xanthosoma by Dr. Staudingcr, the 

 Bornean form as P. macareus, var. macaristus by Mr. Grose Smith 

 ( = P. macareus, var. horne'ensis, Staudingcr), and the Palawan form as 

 P. macareus, var. maccabccus, also by Staudingcr. I have figured a very 

 curious aberration of P. macareus from Sikhim in the Journal of the 

 Bombay Natural History Society, vol. vii, page 345, n. 18, pi. I, fig. 1, 

 male {IS92). 



