ON NEW AND LITTLE-KNOWN LEPIDOPTERA. 35 



margin bears three white lines, the two outer ones are straight, the 

 inner one is lunulated, the two spaces of the ground enclosed by these 

 three lines are darker than the rest, thus giving the impression of a 

 double series of dark spots divided by the veins and defined on both 

 sides by a white line, the outer series of spots elongated, the inner 

 series lunulated. Hindioing with the usual basal and discai markings ; 

 the marginal markings as in the forewing, except that the first median 

 interspace bears a large oval deep black spot surrounded on all sides 

 except the one touching the outer margin by a ferruginous line, the 

 black spot outwardly bears a crescent of metallic green scales ; a few 

 similar scales touching the submedian nervure in the submedian 

 interspace. Cilia throughout brown, unspotted. 



Certainly nearest to N. atrata, Horsfield, from which it differs in 

 its average smaller size, in the presence of the anteciliary white line 

 on the hindwing on the upperside towards the anal angle, and markedly 

 on the underside by the white markings being narrower and more 

 prominent owing to their pure, instead of sullied, white colour. In 

 Iris, vol. i, 1'888, Herr J. Rober has described " Plebeius " illuensis 

 (p. (34, pi. iv, fig. 30, male I ^1, female), hova Ceram and Aru, and 

 P. dohhensis (p. 65, pi. v, fig. 19, male ; pi. iv, fig. 34, female) from 

 Aru, but though they appear to be closely allied to N. nanda, they both 

 seem to lack the white anteciliary anal thread to the hindwing above 

 in the male, and to have the white markings of the underside broad 

 and sullied as in N. atrata. 



Described from several examples in the collection of Hofrath 

 Dr. L. Martin and my own. 



N.-B. Sumatra appears to be very rich in species of the genus 

 Nacaduha. Of species with the basal area of the forewing on the 

 underside unmarked it possesses N. pavana^ Horsfield ; N. macroph- 

 thalma, Felder ; N. kerriana, Distant ; and a fourth species of 

 which I possess a single female only and consequently abstain 

 from naming it till 1 can obtain the opposite sex. Of species 

 with the basal area of the forewing on the underside marked 

 with a pair of white striga3 in addition to those on the disc it 

 possesses (tailed species) N. atrata, Horsfield = prominens, Moore ; 

 N. hermus, Felder = viola, Moore = unicolor, Rober ; N. aneyra^ Felder 



