IX CEETAIN LEPIDOPTEEA. 329 



Papilio Diphilus, Esp. (Plate XXXIII. figs. 17-20.) 



(1. The larger race, figured by Esper, Aus. Sell. tab. xl.) 



The genitalia are developed under peculiar conditions here. Looking at the d , we see 

 at first no appearance of the usual valves, and the whole aspect is abnormal. The eighth 

 segment does not protrude from under the seventh, but sends out, just at the edge of the 

 latter, a dense arching thatch of long, horizontal, scarlet hair-scales (see PL XXXIII. 

 fig. 20), under which the genital organs are widely exposed, much as in JEurycus and 

 Euryades. 



The valves must be searched for, and then will not be easily recognized. Each is very 

 small, not more than -05 inch in total length, not clad with scales externally ; indeed, I 

 think it would be correct to say, there is no valve at all, but only a naked harpe of valve- 

 shape. Its outline is that of a hand-bell; the margins are thickened, and united at the 

 summit into a rounded knob (=the handle of the bell), which is beset with minute curved 

 sjDines, and bends-over towards the dorsal side *. 



The uncus is a nearly straight wide process, semitubiform, the extremity truncate, but 

 cut into seven obtuse teeth. The scaphium is seen beneath, narrow, short, with only a 

 suggestion of the usual " double teeth." The penis is more normal, wiry, polished, acute, 

 projecting beyond the surrounding organs, slightly above the horizontal. 



(2. The small race.) 



I received a variety from Malacca, much smaller and more elegant than the Java type 

 as figured by Esper, pi. xl., and by Cramer, pi. csxxviii. ; the wings longer and narrower 

 in proportion, the colours much brighter, and the white spot of the macular band in the 

 hind wings longer and narrower, with other slight differences. In this, the bell-shaped 

 valveless harpe is exactly as in the larger form, and is of the very same dimensions. 



The uncus appears in this variety somewhat more truncate, shorter and less cut into 

 points, so far as I have been able to examine it ; the scaphium more keeled, and the 

 other accessories the same. There is a pair of organs forming the floor of the anal cavity, 

 with prominent points, the edges beset with long hairs, which I at first thought might 

 possibly represent the ordinary valves ; but so shallow that the harpes are separate from, 

 and project above, them. But these are possibly the pair of strong angular projections to 

 which the expanded bases of the harpes are usually attached. Their high position here 

 agrees with the position of the harpes, and confirms my conclusion of their nature. 



Papilio Polydokus, Linn. (Plate XXXIII. figs. 21-23.) 



There is much resemblance between the terminal region of the body in this species 

 and that in P. Diphilus, as might be anticipated ; but the structure is here even more 

 aberrant. The horizontally projecting thatch of scarlet hairs is still more copious, 

 descending much further on each side, and even continuing, in coarser form and more 

 irregular arrangement to the bottom. Thus, though the shining black genitalia can be 

 seen, nothing can be defined till this shaggy thatch is removed ; which is accordingly 

 done in my sketch of the parts in situ (PI. XXXIII. fig. 21.) Probably the protecting 



* Compare it with fig. 15 of Nircus. 

 SECOND SERIES. — ZOOLOGY, VOL. II. 46 



