519. Papilio chaon, Westtcood. Arcana Ent. ii, 1845, p. 97, pi. 72, 



figs. 1, 1 o, d; Moore, Cat. Lep. Mus. E. I. C. i, 1857, p. 102; 

 Rotlisch. Nov. Zool. ii, 1895, p. 291: Moore (Sadengia), Lep. Ind. 

 v, 1901-1903, p. 213, pi. 457, figs. 1, la-Id, rf $. 



c? $ . Superficially closely resembles P. Jielemts. The differences 

 are, however, both of structure and of colour. c? Fore wing 

 uppei'side : entirely without tbe thick coating of short hairs on the 

 outer half. Upperside : black with a sprinkling of yellowish-brown 

 scales on the fore wing, that form four longitudinal streaks on 

 the cell and internervular streaks on the outer half. Hind wing : 

 the upper discal white patch larger, formed of elongate broad 

 streaks in interspaces 4 to 7 (not 5 to 7) : no tornal nor subterminal 

 markings. Underside: ground-colour duller brownish black ; fore 

 wing with the diffuse scaling so disposed as to form grey cellular 

 and internervular streaks, the streaks in interspaces 1 a and 1 

 generally white, not diffuse. Hind wing : basal area sprinkled with 

 yellow scales that form three longitudinal slenderjines in the cell ; 

 the upper white discal patch as on the upperside, but the elongate 

 white markings that compose it well divided by tbe black veins ; 

 below the discal white patch there is a small series of white spots in 

 interspaces 1 to 3, the spot in 1 generally, in 2 very often, tinged 

 with ochraceous yellow ; a subterminal complete series of ochra- 

 ceous-yellow lunules followed by adrnarginal narrow white spots. 

 Antenna?, head, thorax and abdomen black; beneath: a line of 

 white on the palpi, the thorax with some linear white markings. 

 $ . Similar. Upperside : ground-colour browner ; fore wing : 

 cellular and internervular streaks more prominent ; in many spe- 

 cimens an obscure diffuse whitish subcostal shading just beyond 

 apex of cell. Underside paler. Fore wing with the cellular and 

 internervular streaks and subcostal postcellular whitish patch more 

 prominent ; the posterior three internervular short streaks on 

 the outer half of the wing white, not diffuse; in a few specimens 

 there is a series of more or less conspicuous admarginal white 

 spots, one in the middle of each interspace. Hind wing markings 

 similar to those in the d" , but larger and more prominent. 

 Antenna?, head, thorax and abdomen as in the 3 , but the abdomen 

 beneath with lateral white markings. 



Exp. 8 $ 124-134 mm. (4-80-5-30"). 



Hab. ]S"epal ; Sikhim ; Assam ; Burma ; Tenasserim ; extending 

 to Siam and China. 



520. Papilio fllSCUS, Goese, Ent. Beytr. iii, 1, 1779, p. 87. 



Race prexaspes. 



Papilio prexaspes, Fetter, Verh. z.-b. Ges. Wien, 1864, p. 320; id. 

 Reise Novara, Lep. i, 1865. p. 107. pi. 15, fig. d ; Wood-Mason fy 

 de NicevMe, J. A. S. B. 1881, p. 254 : Moore (Sadengia), Lep. Ind. 

 v, 1901-1903,- p. 215, pi. 458, figs. 1, 1 a-l c, rf 9 . 



Papilio fuscus prexaspes, RotJtsch. Nov. Zool. ii, 1895, p. 297. 



Race prexaspes, Felcler. Closely resembles P. chaon, from which 



