424 LYCANIDA, BIDUANDA. 
Gonus 161.—BIDUANDA, Distant. (Platz XXIX),. 
Biduanda, Distant, Rhop. Malay., p. 237 (1884). 
** FOREWING, globosely subtriangular, costal margin arched, outer margin convex, inner 
margin nearly straight ; costal mervure terminating on the costa before the apex of the cell 
Jerst subcostal nervule emitted about the middle of the cell, second about midway between 
the first and the third, ¢4rd arising a little before the end of the cell, third and /ourth 
bifurcating at a short distance from the apex of the wing ; diésco-cellular nervules somewhat 
perpendicular ; ¢hird mzdian nervule emitted at the end of the cell, second nearer to the 
first than to the third, #rs¢ emitted beyond the middle of the cell. HINDWING, subovate, 
costal margin arched at the base, and then straight and strongly oblique to the apex, which 
is obtuse, Josterior margin asin Drupadia, Moore, abdominal margin angulated but not so 
strongly cleft as in that genus ; costal mzrvure reaching the apex of the wing, other neura- 
tion much as in Drupadia, Type, Myrina thesmia, Hewitson.” (Distant, |. c.) 
In the forewing the costa is evenly arched throughout, the apex is rather rounded, the 
outer margin slightly convex, the inner angle rounded, the inner margin strongly bowed 
outwardly in the middle in the male, nearly straight in the female ; the costal nervure is un- 
usually short, ending some distance before the apex of the discoidal cell, the base of the second 
subcostal nervule is slightly nearer to the base of the first than it isto the base of the upper 
discoidal, the third subcostal nervule is very short, emitted close to the apex of the wing ; 
the middle disco-cellular nervule is emitted from the upper discoidal a short distance from 
its base, the lower disco-cellular is slightly longer than the upper, both are upright, and in 
one straight line ; the second median nervule is emitted a short distance before the apex 
of the cell ; the submedian nervure is slightly sinuous. In the hindwing the costa is very. 
strongly and regularly arched in the male, much less arched in the female, the apex is very, 
much rounded in the male, less so in the female, the outer margin strongly angled at the 
termination of the second median nervule, the abdominal margin is rather deeply incised 
above the anal lobe ; the costal nervure hardly reaches the apex of the wing, the disco-cellular 
nervules are almost in one straight line, slightly outwardly oblique, the second median 
nervule is emitted a little before the lower end of the cell, the internal nervure is long and 
recurved ; there is a distinct anal lobe and three tails, the outermost at the end of the second 
median nervule the shortest of all, reduced toa mere notch in the male of B&B, ¢hesmia, Hewit- 
son, but quite distinct and well-formed in the female; the middle tail at the end of the first 
median nervule the longest ;the innermost tail at the end of the submedian nervure half as 
long as the middle tail. The secondary sexual characters in the male consist of the strongly 
bowed inner margin of the forewing covering a glandular patch of black differently-formed 
scales on the upperside of the hindwing placed around the base of the first subcostal nervule, the 
larger portion of the patch lying between that nervule and the costal nervure. Eyes naked. 
Mr. Distant describes the inner margin of the forewing of the type of the genus, 
B. thesmia, Hewitson, as “ nearly straight.” Hewitson quite correctly described it as regards 
the male as “ curved, projecting ;” it is, however, nearly straight in the female. 
nr nn EE 
“ FemaLe. Upperswoe, forewing dark violaceous, with the costal and outer margins (broadest at 
the apex) dark fuscous. indwing with the costal, posterior and abdominal margins fuscous, the posterior margin 
darkest, and containing some irregularly sized and arranged ochraceous submarginal spots, one below the first 
median nervule and the submedian nervure, and one at lobular anal angle, each containing a dark fuscous centre ; 
these spots are followed outwardly by a narrow whitish line, and the apices of the ¢ai/s are also whitish. UNDER- 
SIDE, doth wings pale brownish, Forewing crossed by a narrow pale castaneous fascia, outwardly bordered with 
reyish, commencing at lower subcostal nervule and terminating at. submedian nervure, and there are faint 
indications of a greyish submarginal fascia, which is only clearly visible at the posterior angle. Hindwing 
with the apical half reddish-ochraceous, containing firstly an irregular transverse series of metallic bluish 
spots, followed by a more or less obscure and very irregular series of black spots, the outer margin broadly 
blackish, powdered with metallic bluish scales, and with a pale submarginal whitish line ; a distinct 
black spot at lobular analangle, inwardly margined with bluish. Body above more or Jess concolorous with 
the wings, beneath greyish ; Zegs greyish, annulated with dark brownish.” fe 3 
*« T have not seen the male of this species, which will probably prove to be similar to the female, but with- 
out the broad blackish margins to the upperside of the wings.” (Distant, |. c.) ; : F , 
In Mr. Druce’s figure of this species the basal half of the hindwing on the underside is white, in Mr. 
Distant’s figure it is concolorous with the restof the wings. The appearance of the two figures is therefore 
entirely different. 
