( 358 ; 



J ? . Puj/illo ciislor, Gray, Oil. Lep. Im. 11. M. I. p. 21. n. 93 (1852) ; id.. List Lep. In.*. B. M. I. 

 p. 28. n. ICO (1856) : Horsf. & Moore, Cnl. Lep. Ins. Mus. E. 1. C. I. p. 9a. n. 188 (1857) 

 (Clierra Punji ; Sjlhet) : Semper, Wien. Hut. .!/««. VII. p. 281. t. 19 (18G.-i) (gynandro- 

 morphic Fpecimen !) ; Feld., Verh. :. b. Ga. Wicii p. 320. n. 413. it p. 3G7. n. 244 (1864) 

 (Sylhet : Darjeeling) ; Oberth., Kt. d'EiU. IV. p. 49. & p. 114. n. 85(1879) (Sylhet ; Sikkim): 

 Elwes, Ti: Ent. !<ui:. ImiiiI. p. 437. n. 436 (1888) (Sikkim ; not uncommon up to 2000 or 

 3000 feet) ; Robbe, Ann. Sm: E. Hehj. p. 124. n. 7 (IK92) (Darjeeling; Kur.«oong) ; Haase, 

 ['/(fees. iih. Mim. p. 46 (1893) ; Oberth., Et. ,1' Ent. XVII. p. 4 (WJ.\) (Tonkin; ^ with a 

 series of seven spots on hindwings ; iierhipx an <ib. of inehula Grose Smith V). 



(J ?. Ftipilio (CV/»n(.s) ni^lvr, Wood-Mas. t»i Nicuv., J„nni. .1.?. Soc. Bemj. p. 375. n. 180 (1881".) 

 (Cachar). 



(J ?. Tameni cii«tor, Moore, .Xnc Jml. Lep. /,«.p. •.'84(1888) (descr. of " genus " Tum-^ni) ; Swinh., 

 Ti: Ent. Sue. Loml. p. 315. n. 406 (1893) (Kbasia HilLs). 



^ ? . Papilio (Tiimeiv) mstor, Niceville, Gicettterof Hikhut p. 172. n. 480 (1894) (Sikk-im, 1000 to 

 3000 feet, from April to October ; less common than chtwn). 



(a): P. castor West w., forma typ. [c?,?]. 



The upper median nervule of the hiudwing,-; is in the male ahvap, in ^\\e female 

 sometimes, produced into a more or less prominent tooth. In size the nuile is 

 apparently much more variable than the other sex; the "winter" specimen.s are the 

 smallest. 



Though it has not yet been proved by rearing that P. oistw W'estw. and 

 P. pollux Westw. are male und female of the .same species, there can be no doubt 

 that it really is so. The diii'erences between aistor and poilux, if one compares a 

 larger series of specimens, gradually disappear, or nearly so : the patch of the hind- 

 wings of castm- becomes narrower and longer, and the dirty whitish colour of polliix 

 is more and more concentrated to the middle of the wing, and forms a grey macular 

 band across the disc ; when finally the posterior spots of that band disappear, there 

 remains in the fevialea. series of five spots, which are almost shaped as in the extreme 

 form of the male. 



The submarginal spots of the forewings of the female vary very much in 

 number and size. In my female specimens from .Sikkim the whitish colour on the 

 hindwings extends down to the base of the wing, and the greatest part of the discoidal 

 cell above and below is occupied by that colour ; in the Assam specimens the basal 

 half, including the whole of the cell, assumes gradually a uniform brown colour, .-o 

 that the hindwings have a well-defined discal band, which is sometimes of as pure a 

 creamy white colour as in the male se.x. 



Hab. Assam (7 J, 8 ?) ; Sikkim (.5 J, 8 ?). 



('>) : P. castor mehala (iro.se Smith [J,?]. 



cJ ? . Popilio mehdi Grose Smith, Ann. .!/«;/. X. 11. (5). XVIII. p. 150 (1886) (Tungu, Burma) ; 



id. & Kirby, fl/»v'- Ej;A. I. /'r//<. t. 2. f. 1 {^). 2 ( ? ) (1888). 

 (?). S- P'lp'l'O '"-'<"■. Oberthiir, Et. ,1' Ent. XVII. p. 4 (1893) (Tonkin). 



I enumerate this form of castor as a sulisjiecies, though it may turn out to be a 

 mere aberration. At present there are, however, only a very few specimens known 

 which must be referred to mehala; and considering that ca«<oj- inhabits the lower 

 parts of Sikkim, Assam, Cachar, and P. mahadeva Moore the mountainous districts 

 of Burma, the Siamese Shan States, and I'pper Tenasserim, it is quite probable that 

 mehala is confined to the lower parts of Burma, and very likely also to the lower 

 districts of Siam and Tonkin ; the P. castor which Oberthiir {I.e.) records from Tonkin 

 seems indeed, at least partly, to belong to mehcda. 



The male as described and figured liy Mr. H. Grose Smith has n discal series of 

 seven spots on the liindwiugs, of which the two posterior ones are very small and of 



