RHOPALOCERA MALAY AN A. 241 



1. Dacalana vidura. (Tab. XXI., fig. 27 S .) 



Ambli/jiwlia fidiifa, Ilorsfiekl, Cat. Lep. E.I. C. p. 118, u. 45; Th. V. I.e. t. 1, f. 6, Cr( (1829). 



lolam viilnra, Hewits. 111. Diura. Lep. p. 43, u. 10 (1865); Druce, Proc. Zool. Soc. 1873, p. 351, u. 1. 



Wings above bright, dark cirrulean-ljliie ; anterior wings with the costal and outer margins (very 

 broad at ajiex) blackish ; posterior wings with a narrow black posterior marginal line ; the tail-like 

 appendages blackish, with their apices greyish-white. Wings beneath pale brownish, both wings crossed 

 about middle by a narrow white fascia, commencing on costa at about end of cell on anterior wings and 

 terminating near anal angle of posterior wings, where it is waved and angulated ; beyond this fascia is a 

 somewhat waved dark brownish submarginal line, which on posterior wings is amalgamated with the white 

 fascia at anal angle ; a ])lack marginal spot, which is inwardly very broadly margined with ochraceous 

 situate between the second and third median nervules and another black spot surrounded with greyish- 

 white at anal angle ; a posterior marginal black line inwardly bordered with greyish-white, and between 

 the third median nervule and the submedian nervure are some scattered whitish scales almost forming 

 a large and distinct conical marginal spot. Body and legs more or less concolorous with wings. 



Exp. wings, <? , 30 to 40 millim. 



Hab. — Continentallndia ; Silhet (coll. Hewits.).— Malay Peninsula; Penang (coll. Dist.) ; Malacca 

 (coll. Dist.) ; Singapore (coll. Hewits.). — Sumatra (coll. Hewits.). — Java (coll. Horsf.) ; Bantam (coll. Dist.). 

 — Borneo (Druce) ; Sarawak (coll. Hewits.). 



The female sex is unknown to the writer, and the species appears to be comparatively 

 rare, as remarked by Horsfield.* It is also subject to slight local variation. Mr. Hewitson 

 states,! "Examples of this species from Silhet have the anal angle of the posterior wing 

 longer than those brought by Mr. Wallace from Sumatra"; and I notice in the specimens now 

 before me that those from the Malay Peninsula have the white fascia on the under surface of 

 the wings a little narrower than in my Javan examples. It is likewise very variable in size, 

 the smallest specimens examined being from Malacca and the largest from Java, l)ut this 

 smalluess is not peculiar to Malaccan specimens. 



Genus JACOONA, gen. nov. 



Jacoona, Distant [antea, p. 233). 



Anterior wings moderately long and subtriangular ; costal margin strongly arched at base and then 

 very slightly convex to apex, which is obtuse ; outer margin convex, inner margin slightly sinuate. Costal 

 nervure short, terminating on costa before the end of cell ; first subcostal nervule emitted about middle 

 of cell and anastomosed with costal nervure, second nearer to third than first, third arising from end of 

 cell, third and fourth bifurcating a little beyond middle of third ; lower disco-cellular nervule somewhat 

 concavely oblique ; first median nervule at end of cell, second about half the distance from first as from 

 third. Posterior wings elongate and irregularly subovate ; costal margin with its basal third convex and 

 then deflected and oblique to apex, which is rounded ; posterior margin oblique and rounded to median 

 nervules, where it is more or less waved and is provided with two tail-like appendages, viz., a short one at 

 apex of third median nervule and a very long one at apes of submedian nervure ; abdominal margin 

 convex. Costal nervure about reaching apex of wing ; subcostal nervules bifurcating near end of cell ; 

 first and second median nervules emitted close together near end of cell, third at about two-thirds from 

 base of cell. Body and legs moderately robust. Palpi erect ; second joint raised above the level of the 

 eyes, third joint very small and slender. 



* Cat. Lep. Mus. E. I. C. p. 114. t HI- Diuiu. Lep. p. 43. 



August, 1884. 3 q 



