970 
LISTERIA; D AC ALAN A. By Dr. A. Seitz. 
48. Genus: Twisteria Nic. 
This likewise monotypical genus deviates more from the Thecla-Zephyrus group and already approaches 
the Callophrys and Satsuma both of which, however, do not occur in the Indian region. The genus is sufficiently 
characterized by the shape of the wings, the stunted apex of the forewing, and the slightly angular margin 
of the hindwing. 
dudgeonii. L. dudgeonii Nic. (146 B b) is above dark blue with a black margin and black apical half of the forewing; 
beneath red-brown, the basal third of the hindwing is chestnut-brown. Bhutan. 
49. Genus: Dacalana Mr. (Arrhenothrix Nic.) 
The genera Dacalana and Arrhenothrix have been separated owing to the 3 resp. 4 branches of the 
subcostal on the forewing. We have, however, seen in Zesias that this may be a sexual difference, and Fruhs- 
torfer mentions species such as Jalmenus evagoras in which the difference is individual. We therefore unite 
both genera by the name of Dacalana (1884) which is older than Arrhenothrix (1890). 
vidura. B. vidura Hsf. A lustrous sky-blue, $ pale blue; both wings, particularly the forewing with a black 
apical margin; under surface with a white median stripe which shows through above in the $. The typical 
baganda. form originates from West Java; separated from it is the East-Javanese form baganda Fruhst. (155 a) by its 
smaller size, the narrower black apex of the forewing and a finer white median stripe beneath. - - Except in 
Java, where the species is common already in the forests near the shore (e. g. near Palabuan), it also lives in 
Borneo, Sumatra, Nias, and Malacca. — Only farther in the north it is represented by another form 
burmana. (burmana Mr.) which is distinguished by a darker blue upper surface and a lighter, more ochreous-grey ground- 
sinhara. colour of the under surface. Burma. shlhara Frnlist. is smaller than the typical form from West Java; above 
almost 'the same, but beneath darker grey, the white median stripe through both wings is narrower, the orange 
spot in the anal region of the hindwing is larger, but the blue spot smaller. $ with a broad black costa. This 
aziyada. form comes from North-Eastern Sumatra and already forms a transition to aziyada Fruhst. (155 a) which is a 
smaller form with a conspicuously darker under surface, on which the costal end of the white median stripe 
■penicilli- slightly bends round distally. In penieilligera Nic. (155 b), decribed as a separate species, but presumably 
rjpm ' only a large form of vidura , the whole apical third of the forewing is black, and the under surface is crossed 
by a broad white transverse band. Assam, particularly from Sylhet. — All the AS °f this species have a large 
scent-spot in the forewing, in the centre of the submedian area. 
loud. D. lowi Drc. (156 a) is almost exactly like vidura, but on the under surface the white median stripe 
is absent, and the dark line bordering on the marginal area shows a somewhat different course. Borneo. 
sangira. D, sangira Fruhst. is similar to vidura. but darker and more lustrous blue. Marginal band narrower. 
The A lacks above the scent-pencil in the forewing, whereas the hindwing exhibits a large hairy scent-aixa. On 
the forewing beneath the light area above the centre of the hind-margin is so large that the median band already 
disappears in it in the centre of the wing. Sangir. Type in the Berlin Museum. 
cotys. D. cotys Flew. (155 e) is superficially very similar to vidura, but it has not the scent-pencil anymore, 
but the mealy spot on the hindwing. Over the distal parts of the wings above a lilac reflection is spread, so 
that the black distal band is not so distinctly defined. From the Himalaya, through India to the south as far 
sannio. as Burma. sannio Drc. (156 a) flies in Borneo; the white median stripe of the forewing beneath only extends 
to the centre of the wing, it is not half as broad as in typical North-Indians, and parallel to it there is another 
cremera. white arcuate band before the margin. cremera Nic. (155 e) shows a narrow and quite straight white stripe 
beneath, it is much larger than sannio and has a more distinct blue spot between the 2 black dots of the anal 
capusa. region and above this blue a very distinct red colour; from West Java. - capusa Fruhst. (155 e) is again smaller, 
beneath lighter, more dust-coloured grey, the white median stripe is broader, the miniate spot before the small 
upper tail, which in cremera is particularly large, is smaller here. — cotys seems to lie everywhere rather rare. 
As it has only a 3-branched subcostal vein in the forewing, which in Dacalana is said to be invariably 
4-branched, the species was transferred into the following genus; its alliance with the forms of vidura , however, 
is unmistakable. 
anysis. D. anysis Hew. (155 e) is very similar to the preceding one and probably forms only the continuation 
of cotys in Celebes. Above in the A the border of the black apical part runs more obliquely through the forewing, 
so that rather a black apical third is cut off than a marginal band. Beneath the median stripe is somewhat 
curved, and the marginal area of the hindwing is very much intermixed with white. Macassar and in the 
cervina. Minahassa. — cervina Rob., from the Isle of Bangkai, is much smaller, the under surface darker, the median 
stripe is broader, in the marginal area only slightly powdered with whitish. This form was discovered by 
Kuhn. 
an guides. D. anysides Rbr., likewise from Celebes, is said to differ from anysis particularly in a very strongly 
developed scent-organ, the under surface being otherwise almost the same. But the scent-basin below the 
