102 
A LIST OF THE BUTTERFLIES OF BORNEO. 
Nacaduba kerriana, Distant, Ann. Mag, Nat. Hist. ser. 
5, XVIL. p. 293 (1886); 1d- Rhop: Malay. p. 455, pl. 
AD, tier ized. (Sob): 
Labuan (Low) ; Kuching and Santubong (Sar. Mus.). 
Distribution: Tenasserim, Burma, Malay Peninsula and 
Sumatra. 
From an examination of five specimens in the Sarawak 
Museum I have no hesitation in making NV. kerriana, Distant, 
synonymous with this species. Druce! suggested this course, 
but could not be certain without examining a specimen. Ip 
discussing herriana he says (/.c.) ~ the anderen of the figure 
given im “Rhop. Malay. appears to agree well with that of NX. 
angusta but the upperside Has a broader black outer margin.” 
The Sarawak specimens have a very slightly narrower es 
margin than in Distant’s figure, and the fuscous spots along 
the hind-w ing are almost obsolete on the upperside, As these 
upperside marginal fuscous bands and markings are always 
shehtly variable throughout this sub-family of Lycaenidae 
this small difference may be disregarded. ‘The important 
markings on the underside agree remarkably well with both 
descriptions of kerriana by Distant and Bingham,” and with 
Druce’s description of angusta. Bingham (Le. ) remarks that 
the female is unknown, so I append a description of the single 
female in the Sarawak Museum. 
Fremare. Upperside. Fuscous: discal portion lighter and 
relieved by bright iridescent blue. Fore-wing: fuscous 
eround-colour forming broad margin round a discal whitish 
patch. The upper boundary of this patch starts from base 
through middle of cell to a point a little short of half-way 
between end of cell and hind-margin, descends thence to the 
2nd-median nervule whence it continues towards the imner 
margin about 1 millimetre nearer the base. The patch is dull 
at the base, but gradually becomes lighter towards the hind- 
margin. In the lightest part. above and below the third median 
nervule, are two fuscous spots, and slightly nearer the base, 
above and below the 2nd median nery ule, is a similar pair of 
slightly larger spots. The whole discal patch is iridescent 
with brilliant light blue scales. /Hind-wing: a lighter fuscous 
than in fore-wing: the markings from underside show through 
and give a slightly mottled appearance. From base along 
- median nervure a few iridescent light blue scales. ~ A hind- 
marginal border of brown spots between the nervules as men- 
tioned in Distant’s description of the male. — Underside. 
Similar to that of male, except that the markings are eee 
rather more emphasized. — 
1. Proc. Zool. Soc. Lond. p. 578 (1895). - 
2. Fauna Brit. Ind. Butterflies, Vol. Il. p. 384 (1907). 
Jour, Straits Branch 
