444 L, de Niceville & Dr. L. Martin— Butterflies of Sumatra. [No. 3, 
286. Gerydus zinckenii, Felder. 
I possess one female example from Sumatra which agrees with 
typical Javan specimens of this species. It may be known by the 
white area of the forewing on the upperside occupying half the sur¬ 
face, its outer edge straight; in G. sy me thus , Cramer, and G. gallus , 
de Niceville, the pure white area is much smaller, and is confined to 
the disc, not reaching the base of the wing, with its outer edge very 
irregular. 
287. Gerydus g^etulus, de Niceville. 
G. gxtulus, de Niceville, Journ. A. S. B., vol. Ixiii, pt. 2, p. 24, n. 20, pi. v, 
fig. 12 , female (1894). 
On the upperside the forewing is precisely similar to that of 
G. zinckenii , Felder, but the hindwing differs in that instead of being 
dull fuscous throughout, half the surface is white, with a prominent 
fuscous disco-cellular line. On the underside it hardly differs from 
G. biggsiiy Distant. It is rare, I have seen three females only taken in 
July and October near Bekantschan. 
288. Gerydus boisduvali, Moore. 
Very rare, I possess one female only from Sumatra, which is cer¬ 
tainly this species. 
289. Gerydus gassa, de Niceville. 
G. geesa, de Niceville, Journ. Bomb. Nat. Hist. Soc., vol. x, p. 26, n. 10, pi. S, 
fig. 16, male (1895). 
May be known from all the described species in the genus by the 
upperside being immaculate in both sexes. The underside is very 
similar to that of G. biggsii, Distant. It is found from Bekantschan 
to the Central Plateau in January, March and July. 
290. *Gerydus zymna, Doubleday and Hewitson. 
Grose Smith as Miletus zymna. The type of the genus Miletus 
is “ Papilio ” polycletus, Linneeus, from the Moluccas. Mr. Druce has 
monographed the genus in Trans. Ent. Soc. Lond., 1891, p. 179, but 
unfortunately uses the name Hypochrysops , Felder, for it, of which 
“ Theda ” anadetus , Felder, also from the Moluccas, has been fixed 
by Mr. Scudder as the type, and which species is congeneric with 
Miletus polycletus, I may note here that a female example of M. coelis- 
parsusy Butler, described from Nias Island, off the west coast of Sumatra, 
has been obtained on Penang Hill (“The Crag”) by Mr. A. R. Adams* 
and will almost certainly be hereafter obtained in the island of 
