31 
1891.] W. Doherty — A List of the Butterflies of Engano. 
Herr Kheil calls the Nias form 0. amphrysus, Cramer, hut it seems 
unlikely that a Javan species should occur in Nias and not in Engano. 
0. nereis obviously differs from amphrysus in the absence of the yellow 
band across the forewing of the male. The opaque whitish-yellow of the 
underside of the female is a striking character, and distinguishes it 
from a Philippine form, which otherwise resembles it considerably, 
especially in the male sex. 
48. Papilio (Menelaides) aristolochih, Fab. Only one specimen 
taken ; it was quite small. The species seems wanting on the opposite 
coast of Sumatra, being apparently replaced by Papilio antiphus. 
49. Papilio (Iltades) oceani, n. sp. A local form of Papilio 
rnemnon, from Java. Male, above like memnon, but the lines of lnteous 
scales on the forewing are nearly obsolete (slightly visible near the 
apex), and those of blue scales on the hindwing less conspicuous, and 
not nearly reaching the cell. Below, the red basal areas are wholly 
wanting, and the outer grey area much narrower, not at all enclosing 
the series of large black spots. 
Female, forewing above heavily marked with pale luteons bands 
bordering the dark veins over the whole disc, entering the upper end of 
the cell, black rays in the middle of the spaces, the apex darker. Hind- 
wing similar but with the lnteous bands less conspicuous, enclosing a 
series of large black spots. Below, the red basal spots are present, but 
very small, the grey border slightly broader than in the male. 
The absence of the red basal spots above and below in the male, 
above in the female, the obsolete markings of the upperside of the male, 
and the narrow band of the hindwing below in both sexes, easily dis- 
tinguish this species from its allies. 
Only one male and one female taken. 
50. Papilio (Charus) iielenus, Linn. var. enganitts. The lines of 
luteous scales are conspicuous above and below, more or less whitish 
near the lower angle of the forewing ; the red lunules of the upperside 
are absent, except the anal one, which is obscure. Below, the white area 
is large, the marginal white lunules are distinct, the submarginal orange 
ones small and obscure, wanting in the lower radial and upper median 
spaces, giving the insect somewhat the appearance of Papilio prexaspes ; 
the female has a diffused white spot on each side of the radial vein. 
51. Papilio (Zetides) agamemnon, Linn. One tattered male, Bua 
Bua. 
52. Papilio (Zetides) sarpedon, Linn. 
