78 
262 
263. 
A LIST OF THE BUTTERFLIES OF BORNEO, 
Sarawak form by a line of spots and Swinhoe figures a similar 
line of spots for the female from ‘Tenasserim. In other res- 
pects it agrees well with the excellent figure given by Swinhoe 
(Legidopt. Ind. Vol. VII. pl. 612, figs. 2, 2b. 1910). 
It is extremely close to G. gigas, H. H. Druce, but differs 
in the basal region of fuscous almost joining that of the hind- 
margin—one millimetre only separates them in the male; while 
in the female this fuscous area docs not approach that of the 
hind-margin quite so much; in gigas the reverse is the case ac- 
cording to Druce’s description. ‘The swollen portion of the third 
margin quite so much ; in gigas the reverse is the case according 
to Druce’s description. The swollen portion of the third 
median nervule in the male is about one-fifth of an inch long 
as in gigas. It seems probable therefore that there are really 
three forms of G. ancon. 
(1) The Tenasserim-Burma form in which the whole band of 
the fore-wing is completely divided (G. ancon, Doherty). 
(11) The ‘Sarawak form in which it is nearly divided, cul- 
minating in the extreme form— 
(ii) The Mt. Kina Balu form in which the white band 
of the fore-wing in the male is comparatively broad right 
across the wing (G. gigas, Druce). Until further specimens 
come to hand to confirm or refute these suggestions it is per- 
haps better to keep the two species (ancon and gigas) separate. 
The male was reported by the native captor to have been 
in attendance on some immature Homoptera—probably Jassi- 
dae ?—also captured and brought to me. 
Gerydus petronius, Dist. and Pry. 
Gerydus petronius, Distant and Pryer, Ann. Mag. Nat. 
Hist.,ser: 5. X LX.) p.2266) (188%): 
Sandakan, British North Borneo. 
This species is unknown to me. Bingham notes that it is 
very close to, if not identical with, G. longeana, de Nicév. 
Gerydus boisduvali, Moore. 
Miletus boisduvali, Moore, Cat. Lep. Mus. E. I. C. 1. p. 19, 
plo Tas ics esos ison 
Miletus chinensis, Felder, Verh. zool-bot. Ges. Wien. xii. p. 
488 (1862). 
Miletus boisduvali, var. ceramensis, Ribbe. 
Gerydus boisduvali, var. acragas, Doherty, Journ. As.* Soe. 
Beng. p. 186 (1891). 
Miletus irroratus, Druce, Proc. Zool. Soc. Lond. p. 106 
(1874). 
Borneo. 
Jour. Straits Branch 
