MR. A. G. BUTLER ON THE BUTTERFLIES OF MALACCA. 
553 
side than than typical P. polytes. I suspect this variation to be seasonal, and 
not polymorphic. 
13. Papilio helenus, Linnaeus, Mus. Lud. TJlr. p. 185 (1761). <? ? , Malacca, 
14. Papilio prexaspes, Pelder, Reise der Nov., Lep. i. p. 107, pi. 15. fig. d (1865). 
d ? alacca. Not previously in the Museum collection. 
15. Papilio iswara, White, Entom. i. p. 280 (1842). S, Malacca; S ?, Penang. 
16. Papilio saturnus, Gudrin, Deless. Souv. Yoy. d. l’lnde, ii. p. 70, pi. 18 (1843). 
d, Malacca. 
17. Papilio Esperi, n. sp. (PI. LXVIII. fig. 7.) d, Papilio protenor (part), Esper 
[nec 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 mestor, (c?, Papilio androgeos ), Cramer, Pap. Exot. i. pi. 91. figs. A, B 
(1779). Iliades mestor , niibner, Yerz. bek. Schmett. p. 89. n. 931 (1816). ? . Differs 
from the female of P. Esperi 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. S ? , Malacca ; c?, Penang. 
19. Papilio achates, ( ? Papilio achates) Cramer, Pap. Exot. ii. pi. 182. figs. A, B 
(1779). d . Wings much more uniform in colour than in the two preceding species, a red 
basal streak as in P. androgeos ; the red sub marginal 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 , Linnaeus, 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 varuna, White, Entom. i. p. 280 (1842). $ ? Malacca; Penang. The 
type was described from Penang, where it is evidently common. 
21. Papilio diphilus, Esper, Ausl. Schmett. pi. 40 B. fig. 1 (1785-98). 6 ? , Malacca ; 
Penang. 
Family HESPERIIDiE. 
Genus Casyapa, Kirby. 
1. Casyapa thrax, ( Papilio tlirax) Linnaeus, Syst. Nat. i. 2, p. 794 (1767). S, Malacca. 
2. Casyapa irava (. Hesperia irava) i Moore, Cat. Lep. E.I. C. i. p. 254 (1857). 
d ? , Malacca. 
