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Show 1896.1 MR. H. H. DRUCE ON BORNEAN LYCMNLVM. 679 beyond the end of the cell, and that supposing, as I do, that the subcostal nervure reaches the margin, there are only two subcostal nervules-tbe 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 apex. This description of Mr. Distant's led m e to state in P. Z. S. 1895 that the females of this genus possess the same number of subcostal nervules 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 which I have described from Borneo, I find that it is as noted above. JACOONA METASUJA, H. H. Druce. The figure given in P. Z. S. 1895, pl. xxxiv. fig. 4, is not a very good one, as it does not show the beautiful opalescent green which is such a distinctive character of this species. BIDUANDA, Distant. B I D U A N D A HEWITSONII, H . H . Druce. (Plate X X X I . fig. 9, c?.) Biduanda hewitsonl, Druce, P. Z. S. 1895, p. 615. o*. Upperside dark violaceous blue. Eore wing with costa and base narrowly, apex and outer margin broadly black. Hind wing with the shining patch large and conspicuous and extending over half tbe 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 submedian 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, excepting towards the apex, which is black. The underside differs from that of the female, being of a dull pearl-grey, darker and browner towards the apical and costal margins; otherwise as in that sex. Expanse, c? If-ly^r inch, 2 12-1Tu~ incQ> Sandakan. Type Mus. Druce. W e have received several specimens from Sandakan, and Mr. D. Cator has also captured it at that place in March and May. From the description this species appears to be very close to B. cineas, Orose Smith, which I have not seen ; but on the underside the thin metallic blue line extends over the black on the hind wing from the apex to the abdominal margin, whilst in 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. hewitsonii. MARMESSUS, Hiibn. M A R M E S S U S BOISDUVALI, Moore, var. A T R A , nov. 6. Upperside differs from that sex of typical M. boisduvali in |