IN CERTAIN LEPIDOPTERA. 313 



The abdominal apparatus is normal, and well developed. The uncus is moderately 

 long, well curved, slender to the tegumen, terminating in a minute spathula ; the keel, 

 reaching to the point, is moderately deep, the edges not upturned. 



Scaphium of the pattern seen in P. Merope. Its keel is more produced, and of less 

 irregular surface. Its " double teeth " are not quite so much developed, particularly the 

 secondary one of each pair, which is little more than a conic knob, both, however, set 

 with prominences and bristles as in that species, though in a less degree. 



Penis of moderate length and thickness, increasing to the extremity, which is truncate, 

 hiant, without lateral expansions. 



Papilio Batuycles, Zink. (Plate XXXI. figs. 1-5.) 



Here are very abnormal structures. 



The valve is small, short, almost semicircular, widely fringed with dense white hair- 

 scales. The harpe is a broad segment of a sphere, of glassy chitine, thickened at the two 

 margins, and rising at the summit into two divaricating branches, each of which, the 

 dorsal especially, is studded with short stiff blunt teeth ; on the dorsal edge, near the 

 base, there is also a conical process. Parts of the surface are beset with fine scattered 

 bristles. 



There is no uncus proper. The regions are sheltered by a dense horizontal thatch of 

 long white hair-scales. "When these are removed (by the persevering friction of a camel's- 

 hair pencil cut short), we get an instructive sight of the organs. The median line of 

 the eighth segment projects into a very shallow point, from under which a well-formed 

 white scaphium is moderately developed. At fig. 3 is shown the transverse terminal 

 line of the eighth segment, and a vertical view of the scaphium ; the lip-like lateral 

 edges bear no trace of the ordinary " double teeth." At fig. 4 is given a lateral view of 

 the organs. The vertical dotted line shows where the lateral edge of the dorsal arch of 

 the eighth segment falls normally ; but this has been removed, so that we can still 

 follow the outline of the scaphium somewhat further into the abdomen. The median line 

 of the arch is supposed to be retained, forming the roof of the cavity ; and to this we 

 perceive the scaphium is organically attached, descending from it in a great angular 

 heel, in the free interior, and projecting, in the familiar form, from beneath and within 

 the spreading rami of the uncus, where this is (as is usually the case) present. From the 

 median part of its inferior surface there descend membranous lamina! of irregular shape, 

 perforated to allow the exit of the penis. Here this organ, seen in situ at fig. 4, and its 

 tip, more magnified, at fig. 5, is of great length. It appears to be invested with a thin 

 glistening membrane, but only partially throughout its length, expanding and dilating 

 near the tip, which, furnished with a minute finger-like point, is free. In the normal 

 condition it protrudes far beyond the limits of the closed valves. 



Thus every one of the organs is remarkable. The valve, the harpe, the uncus (absent), 

 the scaphium, the penis, all present something unusual. The very simplicity of the 

 scaphium, its lack of teeth, spines, or bristles, seems to deny the " reason of its being." 



SECOND SERIES. — ZOOLOGY, VOL. II. 41 



