IN CEETAIN LEPIDOPTEEA. 309 



moderately regular, the ventral side the longer, the whole margin broadly and pretty 

 evenly fringed. 



The harpe consists of a very thin crystalline plate of chitine, which sits close upon the 

 central cavity of the valve. It is thickened on each side into two slender ridges, black, 

 polished, wire-like, which, springing from a wide basis, proceed in curving bines, and meet 

 in an acute point a little on the dorsal side of the extremity of the valve. The extreme 

 point separates from the lining-membrane, and projects at a very acute angle, firm and 

 hard, like the point of a needle. Under a high power the ventral side of the point is 

 seen to be notched into half a dozen minute saw-teeth : the whole triangular hollow plate 

 may be, with care, lifted uninjured from the valve ; it is then of a glassy transparency 

 and polish, slightly tinged with brown, like glass very slightly smoked ; very slender 

 veins issue from various points of the deep-black thickened marginal walls, and ramify 

 over the clear surface. 



The abdominal armature of the first specimen I examined, seemed to be peculiar. 

 A deep, but short, uncus was seen descending perpendicularly and abruptly from the 

 tegumen, with almost no curvature at all, the upper surface hollow, from the turning- 

 up of the lateral edges, the tip slightly spathulate. 



The scaphium was with difficulty recognizable, wide, shallow, and so short as scarcely 

 to reach the vertical uncus. 



But a second example proved that this condition of the organs was a case of accidental 

 distortion, not very rare. The uncus now was normal in length and curvature, wide, 

 with a small spathulate point, followed almost immediately, in full depth, by a deep and 

 strong radial keel. (PL XXX. fig. 11.) 



The scaphium is on the same pattern as in P. Mayo, still more closely like that of 

 P. Heleuus, both the lateral teeth being very stout, long, acute, dark, and polished. The 

 hinder tooth is rather a high conical incurved point on the thin shelly edge of the cheek, 

 whose summit bears a crest of small erect aristae. The edges are simple, not serrate. 

 Viewed from above, the cheeks take a subglobular, inflated form, and both the teeth of 

 the right side slope-over towards the median line of the uncus. The keel of the scaphium 

 is large but shallow, polished ivory-white, strongly defined in colour from the cheeks. 

 Its form is very boat-like, projecting its point horizontally ; the extreme point is minutely 

 complicate in surface, and diverse in colour and appearance from the contiguous parts. 



The penis presents little noteworthy ; it is of moderate dimensions, a tube apparently 

 subcylindrical, but slightly enlarging to the tip, which ends in a lengthened curved 

 acute finger-point. 



Papilio Turnus, Linn. (Plate XXX. figs. 12-15.) 



Valve very regular in form, of the outline of a Gothic arch, the dorsal margin con- 

 cealed under long shaggy black hair, springing from within, and projecting far beyond, 

 the edge ; the ventral margin is also hairy, but less conspicuously. A flat shelf runs all 

 round, broadest at the extremity, within which the cavity abruptly deepens. 



Harpe of the Thoas pattern, consisting apparently of a dark shining wire, running 

 up on each side, and meeting in an arch towards the tip. In reality, these are but the 

 thickened edges of a continuous plate of chitine, of extreme delicacy and glassy trans- 



