1896.] MB. H. H. DEUOB ON BOBNBAN hYCMSlVM. 679 



beyond the end o£ the cell, and that supposing, as I do, that the 

 subcostal nervure reaches the margin, there are only two subcostal 

 uervules — the first being emitted rather beyond the middle of the 

 cell and entirely free for its whole length ; the second being 

 emitted rather more than halfway between the end of the cell and 

 the ajiex. 



This description of Mr. Distant's led me to state in P. Z. 8. 1895 

 that the females of this genus possess the same number of sub- 

 costal uervules as the males, which now turns out to be incorrect. 

 They have the same number as the females of Neocheritra (viz. 

 three), but the first appears to be more bent towards the costal 

 nervure than in that genus. 



On examining the neuration of the two species vrhich I have 

 described from Borneo, I find that it is as noted above. 



Jacoona mbtasuja, H. H. Druce. 



The figure given in P. Z. S. 1895, pi. xxxiv. fig. 4, is not a very 

 good one, as it does not show the beautiful opalesceut green which 

 is such a distinctive character of this species. 



Biduanda, Distant. 



BiDUANDA HBWiTSONii, H. H. DrucB. (Plate XXXI. fig. 9, c? .) 



Biduanda hewitsoni, Druce, P. Z. S. 1895, p. 615. 



(S . Upperside dark violaceous blue. Fore wiug with costa 

 and base narrowly, apex and outer margin broadly black. Hind 

 wing with the shining patch large and conspicuous and extending 

 over half the cell, centred by a large patch of differently-placed 

 cream-coloured scales ; apex and anal angle black ; a quadrate 

 white spot between the lower median and sub median nervure, 

 placed above the black ; a small white patch outwardly bordered 

 by a black line between the two lower tails ; lobe dusted with pale 

 blue scales. Cilia of fore wing black, of hind wing white, except- 

 ing towards the apex, which is black. The underside differs from 

 that of the female, being of a dull pearl-grey, darker aud browner 

 towards the apical and costal margins ; otherwise as in that sex. 



Expanse, J 1|-1A ^^'^^^ ? ^a'^A i'^'^'^- 



Sandakan. Type Mus. Druce. 



We have received several specimens from Sandakan, and Mr. D. 

 Gator has also captured it at that place in March and May. 



Prom the description this species appears to be very close to 

 B. cineas, Grrose Smith, whicli I have not seen ; but on the under- 

 side the thin metallic blue line extends over the black on the hind 

 wing from the apex to the abdominal margin, whilst iu B. cineas 

 it appears to be only at the anal angle. The female, as described, 

 of B. cineas is quite different from that of B. hetvitsonii, 



Mabmbssus, Iliibn. 

 Mabmessus boibduvali, Moore, var. atba, nov. 

 cf . Upperside differs from that sex of typical M. boisduvali in 



