IN CEETAIN LEP1D0PTEEA. 331 



Papilio Antenor, Dru. (Plate XXXIII. figs. 21-26.) 



Valve of the rotundo-triangular outline common to tlie genus Oru'dhoptera, and nearly 

 as large as in some species of that genus. Exteriorly of an uniform drah-white ; a fringe, 

 of dense hair-scales, projects beyond the dorsal margin, the continuation of the common 

 clothing ; the ventral margin is unfringed. Interiorly, the lining-membrane is of a 

 rich umber-brown hue, dully shining ; the contour forming a wide flat edge or shelf all 

 round, whence it falls abruptly in a deep cavity. This is occupied by a wide bell-shaped 

 harpe of glossy chitine, hollow, like the cavity which it occupies, and terminating in a 

 rounded knob, slightly bent towards the dorsal side. This is almost exactly the figure 

 and appearance of the (presumed) harpe in Diphilus, only that I cannot detect the slightest 

 trace of serration on the knob or on any other part. The knob is spoon-shaped, hollow, 

 with an elevated, thickened, overturned edge. 



The uncus is nearly horizontal, straight, short, bluntly pointed, being thickened at 

 the edges and tip. The surface, though shining, is uneven, and lacks that glittering 

 polish which this organ usually displays. A shallow sulcus runs along the summit 

 to the point. Below, attached to it by short white fibres, is a small scaphium, in which 

 I detect no teeth. The penis is very minute, and scarcely visible, far within the abdo- 

 minal recess. 



Papilio Hector, Linn. (Plate XXXIII. figs. 27-31.) 



We have here the same type of structure as in Polydorus, but with remarkable modi- 

 fications of the organs in detail. There are, again, no proper valves ; the posterior 

 extremity appears as an oval opening ; the area occupied by a confused set of shining 

 black knobs, surrounded by a dense horizontal thatch of scarlet hair, which, however, is 

 not so long as in Polydorus. 



The uncus is a short spathulate point, abruptly bent perpendicularly from the middle 

 of the transverse edge of the downsloped roof of the ninth segment. Its shape, as seen 

 directly from behind, is shown at fig. 28. 



At its point just meet the summits of a pair of organs, answering to the (suggested) 

 scaphial teeth (see Polydorus, p. 330), but of very bizarre form. Side wise they an 1 

 not unlike the corresponding organs in Polydorus, very highly polished, like them ; 

 but when looked at directly from below, each is seen to send off a broad process of sub- 

 trigonal outline, horizontally, toward the middle of the cavity. The process is a sort of 

 flat cushion, apparently of short close pile, throughout which are set minute slender 

 needle-like spines vertically. The end is a thickened knob, whence descends obliquely 

 a group of very long straight bristles (see fig. 29, the right "scaphial tooth" seen 

 from below). 



What I suppose to answer to the valves, are still further disguised here, each being 

 a slender straight rod (fig. 30), with the point bent dorsally, nearly at a right angle, and 

 bearing a short spine ; while the dorsal margin is so beset with short straight bristles, as 

 to give to the whole organ the appearance of a comb. The base is broadly dilated ; and 

 the pair incline towards each other, so that the summits are almost in contact. 



Between them projects the very much developed penis, the tip forming a curved acute 



46* 



