142 LYCASNIDA. NACADUBA. 
curved upwards and touching the costal nervure, second subcostal at one-fourth, ¢Aévd subcostal 
close to the end of the cell, fourth subcostal at beyond one-half from the third and terminating 
at the apex, fifth subcostal [upper déscoida’] from the end of the cell; disco-cellular nervules 
slightly concave, radial [/ower déscoidal] nervule from their middle ; déscotdal cell broad, long, 
extending more than half the wing ; second median nervule from the angle before the end of the 
discoidal cell, #rs¢ median at one-third before the end ; sudmedian nervure straight. HINDWING, 
bluntly oval, furnished with a single sl ender ¢az/ [at the termination of the first median nervule, 
sometimes wanting]; costal mervure arched at the base ; first subcostal nervude curved upwards, 
emitted at one-sixth before the end of the cell ; disco-celludar nervules slightly oblique, discoidal 
nervule from their middle ; déscoidal cell broad ; third and second median nervules from the end 
of the cell, #vs¢ median at nearly one-half before the end; sudmedian and internal nervures 
straight. Bopy moderate, rather short ; pa/fz porrect, second joint extending more than 
half beyond the head, laxly pilose beneath; /egs slender ; axtenne with the club grooved, 
pointed. yeshairy. Type, WV. prominens, Moore.” (Jfoore, |. c.) 
In the forewing the costal nervure terminates about opposite to the apex of the cell; 
the first subcostal nervule immediately after its origin is directed up to the costal nervure, 
with which it completely anastomoses for some little distance ; the vein is not short as 
Mr. Moore supposes, being of ordinary length ; the second subcostal has its base nearer to 
the base of the first subcostal than to that of the upper discoidal ; the third subcostal is rather 
short, emitted about midway between the apex of the wing and the base of the upper discoidal ; 
the discoidal cell does not extend beyond the middle of the wing ; the disco-cellular nervules 
upright ; the second median nervule emitted a little before the lower end of the cell. 
The chief peculiarity of the genus is the presence in it of two groups, a tailed and a tailless. 
The tailed group consists of two distinct species, and a third, which I believe to be dimorphic, 
has one form tailed, the other tailless. Had it not been for the existence of these three species, 
and of the single species of the genus AZegisba, Moore, it would have been easy to divide the true 
‘*blues ” (as distinct from the ‘ coppers ” and ‘‘ hairstreaks ” ) into two groups, one furnished 
with tails, the other lacking them ; but Macaduba comprising within itself a species combining 
both characters, besides others with and without this feature, and A/egisba malaya, Horsfield, 
also having tails in some individuals, lacking them in others, rendered that course impossible. 
Breeding may hereafter prove that the tailed and tailless forms of WV. avdates, Moore, the dimor- 
phic species, are truly distinct species, though the neuration of the imagines of the two forms 
is precisely similar, in which case it would be convenient to place the tailless form of WV. ardates, 
together with WV. dana, de Nicéville, and MW. hampsoniz, de Nicéville, in a separate genus. 
The two forms of WV. ardates may be distinct, though I much doubt it ; but I feel quite sure 
that the tailed and tailless forms of AZ. malaya represent but one species, 
All the species of the genus Macaduba are of some shade of blue, violet, or plumbeous- 
purple on the upperside in the male, with a narrow outer black margin. The underside of both 
sexes is of a greyish or ochreous-brown colour, crossed by whitish lines in pairs or catenulated 
bands ; there is usually a prominent black spot on the outer margin in the first median inter- 
space of the hindwing usually crowned with orange and marked with some metallic-greenish 
scales. The female bas the upperside black, the disc and base of both wings more or less marked 
with blue or purple iridescent scales, which in JV. atvata, Horsfield, look pearly white in some 
lights. The outer margin of the hindwing usually bears a series of black spots, that in the first 
median interspace being the largest. 
As regards the distribution of the genus, two species, V. xora and MN. macrophthalma, both 
of Felder, have been recorded from Australia, otherwise it appears to be strictly confined to 
the Indo-Malayan region. The genus has so lately been constituted that it is impossible to say 
how many species it contains. It seems to bea natural one, all the species have a similar 
facies, and are readily recognisable. The transformations of a single species, WV. promdnens, 
Moore, are known, and will be found very briefly described under the description of that 
species. Both the larva and pupa appear to be of the usual lycaenid type. 
