IN CERTAIN" LEPIDOPTERA. 291 



resembles a very flat spoon or slice, with the edges turned-up like a dish ; there is no 

 sensible thickening at the bend (or " wrist "), as is usual; the teeth are ahout fourteen, 

 sharp and strong, varying in size inter se, standing up around the edge, and one or two 

 within the edge. They are not black, as usual, but of a deeper tint of gall-yellow, proper 

 to the chitine.The arrangement was not quite the same in the specimens ; but a common 

 pattern was quite discernible. The three behind the bend were much longer and 

 slenderer than the rest, in each example. 



Uncus moderately long, little decurved, of a shining red hue, indicating, like the paler 

 colour in the teeth of the harpe, an inferior degree of density in the chitine ; rather 

 slender, the base small, the extremity subdigitate. 



Scaphkim large, long ; keel abruptly deflected, much as in Rhadamanthus ; the aristate 

 lobe set nearer to the base. 



Penis dark red, glittering ; its extremity widely ventricose, one-sided, exactly as the 

 organ in Haliphroh and Darsius would be if not burst. By looking steadily into the 

 expanded orifice, under a very good light, I could, distinctly see that there was nothing 

 in the throat but the wall of the organ, thick, indeed, and apparently composite, but 

 pellucid. Not the slightest trace of the white pulpy matter was visible in any part, 



Oknithopteka Brookeana, Wallace. (Plate XXVII. figs. 5-8.) 



Valve small, of peculiar form, almost circular, with irregular projections, having a 

 marked resemblance to that of O. Remus, but still further removed from the normal 

 form. There is no finger-point at the usual place ; but a prominent one at a part of 

 the margin diametrically opposite, viz. at the back of the dorsal margin very near the 

 hinge *. The exterior is densely clad with minute scales of dead-black hue, which be- 

 come a very wide fringe of dense brush-like hair all around the margin. The interior, 

 which is very concave, almost hemispherical, with no submarginal shelves, is lined with 

 a separable membrane, dull black. 



Harpe of unwontedly large size, not only relatively, but actually ; of peculiar form, 

 broad, fiddle-shaped, concave, the extremity semicircular, expanded, slightly separated 

 from the lining membrane, and bent up ; set with about twenty-five very minute, 

 irregular, black teeth, along its itpturned edge. 



The toothed margins of the opposing harpes converge upon the spot, within the 

 genital cavity, where the hook of the uncus should be. But this ancillary organ is, in 

 0. Brooheana, wholly aborted, the posterior edge of the dorsal arch of the eighth 

 segment forming — instead of a projecting triangular point, = the tegumen of Dr. 

 Buchanan White, — two rounded lobes, with a deep mesial notch between them (see 

 fig. 10) ; while the middle of the outline, which ought, normally, to be prolonged into a 

 curved wiry uncus, projects but a very shallow point, barely sufficient to fill the notch. 



The scaphium is very large ; the two lateral hemispherical lobes well developed — with 

 the median furrow, along which the uncus usually passes — but no bounding crests of 



* When the valves are shut, these two projecting points, one from each valve, fill up the blank left by the absence 

 of the usual advancing rami of the uncus. 



41* 



