172 BUTTERFLIES. 



473. Papilio (Achillidcs) arcturus, "Westwood. 



Found with P. krislina, Moore, and at the same seasons. By no 

 means common in Sikhim. It occui's also in Western and Central 

 China. 



474. Papilio (Sarbaria) ganesa, Doubleday. 



Occm's throughout the warm months at low elevations, and the 

 male is very common. The female is, however, very rare, as are those 

 of P. paris, R. krishna, and P. arcturus. 



475. Papilio (Iliades) agenoe, Linnreus. 



The Indian form is more generally known as P. androgens, 

 Cramer, The female is polymorphic, but three distinct (though each 

 is more or less variable) forms may be defined ; the first is tailless, 

 and is most like the male; the second is also tailless, but has a large 

 white patch on the hindwing; the third is tailed, and is much marked 

 veith white spots on the disc of the hindwing. The species has received 

 a vast number of names, but it is more than doubtful if the best of 

 them represent anything but "local races." It is a very common 

 species in Sikhim, and is found from April to December from the Terai 

 to 5,000 feet. The second form of the female is alone rare, the third 

 is the commonest of the three forms. 



476. Papilio (Iliades) polymnestor, Cramer. 



Mr. Otto Moller obtained a single specimen in Sikhim. It is 

 purely a species of the plains. 



477. Papilio (Sainia) protenor, Cramer. 



Somewhat rare in Sikhim, and occurs from 2,000 to 5,000 feet 

 throughout the warm months. It is common in China. The female 

 is still rarer, and lacks the patch of modified buff-coloured scales on 

 the costa of the hindwing on the upperside. 



478. Papilio (Charus) helenus, Linnneus. 



Found throughout the summer commonly at the lower elevations 

 and as high as 6,000 feet. It is probably the commonest Papilio 

 occurring in Sikhim. It is found right across China to Japan. 



479. Papilio (Charus) chaon, Westwood. 



A common species at low elevations from April to October. 



480. Papilio (Tamera) castor, Westwood. 



Flies from 1,000 to 3,000 feet from April to October, and is less 

 common than P. chaon, Westwood, and P. helenus, Linnaeus. 



481. Papilio (Laertias) polytes, Linnajus. 



A common species throughout the year, except in the three 

 coldest months, at low elevations. The female is trimorphic; the first 

 form is like the male ; the second form mimics P. arisfolochice, Fabricius ; 

 and the third form mimics P. hector, Linnaeus. The latter form is 



