324 ME. P. II. GOSSE ON THE CLASPING-OEGANS 



an adventitious lamina, of conical outline, which also stands up in the line of vision, and 

 doubtless constitutes an auxiliary prehensor. All the three points are thickly beset with 

 fine hairs, which make the resolution of their form difficult, and, one would think, must 

 interfere with their prehensile effectiveness. There is no secondary tooth on the dorsal 

 edge, which curves inward in a deep semicircular sweep to the broad expanded base. 



The uncus is very long, and of excessive slenderness, almost quite straight, its ex- 

 tremity accurately reaching the point where the dorsal elevations of the two harpes meet 

 and touch each other. The scaphiurn is very small and shallow; its " double teeth" 

 conspicuous as a great spine on each side, having a downward curve. The most remark- 

 able feature is the penis, which, like the uncus, is of extraordinary length and slender- 

 ness, resembling an attenuated, highly polished, black wire, nearly straight, proceeding 

 from its conical investment almost directly downwards, and actually protruding between 

 the valves below to the distance of an eighth of an inch; so that the insect could be 

 easily handled and turned about by it, as if it were an inserted pin. The extremity of 

 this organ is produced above (structurally above, though actually beneath, because its 

 position is reversed) into a finger-point, which is abnormally long and acute ; while 

 below it forms a wide, somewhat tumid, trumpet-lip, of exceedingly attenuate trans- 

 parent yellow chitine (?). So far the appearance has been paralleled in many other ex- 

 amples of the organ ; but what follows is more remarkable. Erom out of the trumpet-like 

 orifice proceeded what seemed a blown bladder, wider than the orifice itself, as if it had 

 expanded as it issued, not quite globular, of a substance resembling that of the lip, but 

 still more delicately thin, which, however, had dried in form and in place. It had all 

 the appearance of an integral organic tissue — not of an excretion. 



Papilio Akchesilaus, Feld. (Plate XXXII. figs. 22-24.) 



J'alce rotundo-triangular ; the extremity very obtuse, but fringed with graduated hair- 

 scales projecting into a long and sharp point ; the other margins only minutely fringed. 

 The middle of the cavity is occupied by a large harpe, crescentic when viewed vertically 

 to the plane of the valve ; the cusps, which point ventrally, are raised considerably from 

 the floor ; the one next the base pointed, the other obliquely truncate. Both the points, 

 and the interior curvature, as well as a ridge that takes a parallel curve, are serrated 

 with sharp teeth. 



The uncus is horizontal in its total direction, but has a double sigmoid curve; and its 

 extremity, which is suddenly bent doAvnward, is trifid, with blunt points. The scaphium 

 is small, and so closely adherent to the uncus that the boundaries can scarcely be dis- 

 cerned. I detect no trace of the " double teeth." The penis presents nothing specially 

 notable : it is small, fingered, and retreating. 



Papilio Zalmoxis, Hewits. (Plate XXXII. figs. 25-28.) 



Valve large, trigonal, with rounded angles, nearly equal-sided. Exterior densely 

 clothed with shaggy fur of hair-scales, which project from all the free margins, forming 

 an even, wide, buff fringe to the interior side, which is deeply concave, almost hemisphe- 



