MR. A. G. BUTLER ON THE BUTTERFLIES OF MALACCA. 553 



side than than typical P. polytes. I snspect this variation to be seasonal, and 

 not polymorphic. 



13. Papilio helenus, Linnaeus, Mus. Lnd. Ulr. p. 185 (1764). <? ? , Malacca. 



14. Papilio prexaspes, Pelder, Reise der Not., Lep. i. p. 107, pi. 15. fig. d (1865). 

 c? ? alacca. Not previously in the Museum collection. 



15. Papilio iswara, White, Entom. i. p. 280 (1842). $, Malacca; <? ? , Penang. 



16. Papilio sattjrntts, Guerin, Deless. Souv. Yoy. d. l'lnde, ii. p. 70, pi. 18 (1843). 

 .c?, Malacca. 



17. Papilio Espeei, n. sp. (PI. LXVIII. fig. 7.) $, Papilio protenor (part), Esper 

 [nee Cramer], Ausl. Schmett. pi. 29. fig. 2 (1785-98). ? . Primaries above grey, with a 

 diffused broad subapical white band, the base, veins, and broad streaks between them 

 black, a red patch at base of discoidal cell ; secondaries precisely as in the male, but with 

 a red spot on anal angle ; differences below as above : expanse of wings 5 inches 10 lines, 

 c? ? , Malacca ; ? , Penang. 



18. Papilio "mestob, (<$, Papilio androgeos), Cramer, Pap. Exot. i. pi. 91. figs. A, B 

 (1779). Iliades mestor, Hiibner, Yerz. bek. Schmett. p. 89. n. 931 (1816). ? . Differs 

 from the female of P. Bsperi in having the white patch of primaries transferred to the 

 external angle, and the wings longer ; below, the differences are the same as in the 

 male. Expanse of wings 6 inches 5 lines. <? ? , Malacca ; <?, Penang. 



19. Papilio achates, ( ? Papilio achates) Cramer, Pap. Exot. ii. pi. 182. figs. A, B 

 (1779). S . Wings much more uniform in colour than in the two preceding species, a red 

 basal streak as in P. androgeos ; the red submarginal spots below much more restricted, 

 as in the female : expanse of wings 5 inches 6 lines. $ ? , Malacca. 



Most Lepidopterists have united the three preceding forms in their collections as 

 polymorphic varieties of P. agenor, Linnseus, noticing only the differences of the 

 females. I am satisfied that all three (with other forms referred to P. memnon, agenor, 

 and protenor) are distinct species. 



20. Papilio vabuna, White, Entom. i. p. 280 (1842). $ ? Malacca ; Penang. The 

 type was described from Penang, where it is evidently common. 



21. Papilio diphiltjs, Esper, Ausl. Schmett. pi. 40 B. fig. 1 (1785-98). c? ? , Malacca ; 

 Penang. 



Family HESPERIID^]. 

 Genus Castapa, Kirby. 



1. Castapa thrax, (Papilio thrax) Linngeus, Syst. Nat. i. 2, p. 794 (1767). <?, Malacca. 



2. Castapa ieava (Hesperia irava), Moore, Cat. Lep. E.L C i. p. 254 (1857). 

 c? ?,. Malacca. 



