436 
ZEUXIDIA. By H. Fruhstoreer. 
described from Borneo, bnt is even there separated into two local races, of which the name-type probably comes 
horsfieldi. from the east and north, while the name of horsfieldi Fldr. is transferred to the form from south-east Borneo. 
We figure the first named, from which the southern race diverges in the reduced violet-blue oblique bars on the 
pryeri. forewings of $$. — pryeri Btlr. is an abnormal form from North Borneo, in which, probably during the pupal 
state, the blue scales of the upper surface have been converted into grey and are partly wanting. The insect 
thus has such a peculiar appearance, that Butler was mislead into founding upon this single a new genus 
sumatrana. ,,Zeuxaltis“ (Ann. Mag. Nat. Hist. 1897 XIX, p. 470). — sumatrana Fruhst. type in coll. Dohrn (Stettin), 
appears to inhabit exclusively the Lowlands, and differs from doubledaii from Borneo, — with which it has 
in common the shape of the yellow rayed hairs — as follows; $ ground colour deeper black. The blue band 
on the forewings broader, that on the hindwings narrower, especially towards the costa. Both bands darker 
and pure metallic blue, without a trace of the violet gloss, which is always noticeable in doubledaii from 
Borneo, especially on the hindwings. The hindwings distally black-blue bordered. Underside; markings more 
nicevillei. conspicuous, and distal white suffusion beyond the red-brown, sharply defined median band. — nicevillei 
Fruhst. (102 c) with the type, from the Battak Hills, in my collection. The $$ easily distinguished from the 
doubledaii $$ by the black instead of yellow hair tufts on the upperside of the hindwings. Further, doubledaii 
has the longitudinal bands of about equal breadth costally and anally, whereas nicevillei shows bands costally 
strongly broadened, anally strikingly narrowed, sometimes pointed. But the submarginal bands on the hindwings in 
doubledaii are broadened towards the anal angle, while in nicevillei they are gradually, but unmistakeably narrowed 
downwards. The have not hitherto been known with any degree of certainty, although I had already 
described one from the Battak Hills in 1895. I have now no less than 25 specimens, and on the ground 
of this material I confirm my previous identification. The nicevillei $ diverges much less from the doubledaii 
habitus than does the yet it differs constantly from the Borneo doubledaii in the following characters; the 
subapical oblique bar on the forewings always much broader, purer white, as are also the median spots on 
the forewing, which are always separate, whereas in doubledaii they are usually confluent. Hindwings costally 
with richer and darker blue-violet suffusion, the wedge-shaped marginal and submarginal markings more pro¬ 
minent. In general nicevillei $ recalls what Distant (Rhop. Malay, pi. 38, fig. 6) figured as doubledaii $; none 
of my 25 Sumatra $$ show anything like the light violet tints, still less the confluent median band of spots 
on the forewings, nor the distinct, violet submarginal band on the hindwings, as seen in Distant’s figure. Since 
also the $ as figured by Distant (text figure on p. 424) differs both from the Borneo doubledaii and the 
sumatran nicevillei, it is evident, that the Perak form cannot be the same as the sumatran, as Nioeville 
remarked (Butt. Sum. p. 392). I therefore considered myself justified in giving to this doubtful Perak form 
chersonesia. the name of doubledaii chersonesia (vide Iris 1906). There remains only one question. Does Distant ’s <?, 
p. 424 belong to the $ on pi. 38, or do they represent unconnected sexes of two species ? Now, in the primeval 
forests of the Lowlands on Sumatra specimens occur with yellow, instead of black hairtufts on the hindwings, 
so closely allied to doubledaii, that I have described there (Iris 1906) as doubledaii sumatrana. It is further 
very probable, that forms of doubledaii exist on the Malay Peninsula with yellow and black scent tufts on the 
hindwings, and the future must decide, whether we may place these forms as doubledaii doubledaii Westiv. 
North Borneo, doubledaii horsfieldi Fldr. South Borneo, doubledaii sumatrana Fruhst. Sumatra, doubledaii 
chersonesia Fruhst. Perak, nicevillei nicevillei Fruhst. mountains of Sumatra, nicevillei subsp. Perak, or adopt 
the following order; doubledaii Westw. North Borneo, doubledaii horsfieldi Fldr. South Borneo, doubledaii 
nicevillei Fruhst. Sumatra, doubledaii nicevillei forma sumatrana Fruhst. lowlands of Sumatra, doubledaii cher¬ 
sonesia Fruhst. Perak, of which there may eventually prove to be two forms. One of these I described from 
a $ in the Berlin Museum thus; <$ band on forewings narrower anally than in the sumatran nicevillei. Band 
on hindwings much broader, especially towards the costa; it is indeed somewhat narrowed downwards, but 
much less than in nicevillei, while in doubledaii it becomes broader. The hairs of the costal scent tuft longer 
and darker than in nicevillei. The cellular scent tuft arises from a smaller and duller speculum, and appears 
to have fewer hairs, although the specimen was quite fresh. The violet band on the hindwings is placed further 
inwards than in doubledaii, whereby the terminal border has space for further expansion as is shown in Distant’s 
figure. This violet longitudinal band runs proximally straighter, is not so much indented by the black ground 
colour as in doubledaii. The second, inferior scent tuft, in the cell of the hindwing, so marked in doubledaii, is 
represented in the new form only by scanty hairs, feathering the edge of the cell. To judge by Distant’s 
illustration, the $ is as large as most imposing doubledaii $$ from North Borneo and larger than the q 1 . 
The submarginal bands on the forewing are intermediate in colour between doubledaii and nicevillei. The whitish 
violet spots between the lower radial and the submedian are more prominent, especially the outer admarginal 
spots. The white apical spot is more prominent than in my lightest doubledaii $. The rich violet marking 
on the hindwings surpasses that of my nicevillei $ from Sumatra. Habitat, Perak; 1 <$ Berlin Museum; $ 
