IN CEETAIN LEPIDOPTERA. 293 



Tlie two inner angles of the trapezoid were stout short points, rising free from the valve, 

 and all of deep hue and glittering surface, indicative of great density. 



This, then, is doubtless the harpe ; and the reason why I had not found it in either of 

 the separated valves is, that it is very readily detached from the lining-membrane; and 

 so, when the valve is removed from the abdomen, it is apt to leave behind the harpe, 

 which remains in situ. It is, indeed, widely different, both in form and position, from the 

 organ, as I have found it in all the other species of Ornithoptera that I have examined ; 

 but it is probably very effective, as I hope to show. 



The uncus is long, slender, wiry, horizontal, nearly straight, bent slightly down at the 

 tip, proceeding from a very small triangular base. The scaphium is greatly developed, 

 forming various folds, the usual white hue becoming brown, and even black in several 

 places. Its " double tooth " is a long horizontal spine on each side of the uncus, with 

 only a slight projection behind it ; and, behind this, the upper edge of the scaphium l'ises 

 above the level of the uncus, in several minute bristled points. 



The penis is thick, enlarging to the extremity, which is truncate, with a corrugate 

 expansion, and a terminal finger-point, which, as well as the denser, darker side of tin- 

 column, is here placed below. It issues from a sheath formed by a descending fold of 

 the scaphial tissues. Between it and the scaphium on each side projects the long w 

 of the harpe already alluded to. Though its position and direction, when in the valve, 

 look awkward, yet, when viewed in situ, we see that, on each side, this acute elastic wire 

 brings its curved point just below the spot where the similar wire of the uncus comes ; so 

 that the three points converge, and doubtless secure a very effective grasp of the female 

 abdomen ; though I must confess the scaphium appears to be very much in the way. 



The 0. amphrisius mentioned by Dr. De ITaan (see p. 267, supra) is certainly not this 

 species; but appears to be the Amphrisius figured by Lucas (Lep. Exot. ; pi. ii. fig. 1), 

 which is the same as the preceding O. rhadanianthus of Boisduval (ut supra, p. 289). 



Ornithoptera Remits, Fabr. (Plate XXVII. figs. 12-20.) 



Voice transversely ovate ; a small horny curved finger-point on the dorsal corner of 

 the front edge, not quite constant, being sometimes reduced to a low prominence. There 

 is another similar prominence somewhat more in front, which also varies in height. 

 Little fringe is seen, and that only on the dorsal margin. The cavity is diminished by 

 an obscure, wide, flat shelf, extending along the ventral slope, studded with minute 

 bristles pointing inwards, and also by a curious large knob, at the dorso-anterior corner, 

 very constant, which is followed, in front, very abruptly, by a deep sulcus. This knob 

 is black, hirsute, often hoary, and lies immediately behind the finger. Occasionally, the 

 valve, when detached, brings away a holloAV, shell-like, triangular plate of chitine, which 

 had formed part of its hinge. 



Harpe an irregular rotundo-triangular shell, or ear-like body, of polished black chitine, 



broad, but unusually short, often not reaching halfway from the base to the point of the 



( valve. Its edge is seen to be minutely serrate. When removed, and viewed on the stage 



of the microscope, very obliquely, so as to bring the free edge (the ventro-anterior edge) 



