IN CERTAIN EEPIDOPTERA. 327 



far as to show that what I have called the spoon-like plate is not, as looked at, concave, 

 but convex, the outside of a hollow cone or helmet. 



The tegurnen, in situ, is concealed under the seventh segment, even when this has 

 been considerably denuded ; the uncus, however, protrudes, but much disguised. For 

 it is almost straight, projecting horizontally, with a slight sigmoid curve, and having 

 for its termination, instead of the usual spathulate point, three short, slightly divergent 

 fingers. Beneath this representative of the uncus there is the long narrow scapkium, 

 with shallow keel ; but, from the close contiguity of the parts, and their minuteness, I 

 could not be quite certain of the presence of the " double teeth," though once or twice 

 I thought I discerned them. 



If we compare this fine American butterfly with the still finer, closely related P. Arclie- 

 silaus of Felder (p. 324 supra), we find almost identity in the form of the uncus, but 

 great divergence in the forms of the valve and the harpe. 



Papilio Papmatus, Gray. (A. D.) (Plate XXXIII. fig. 7.) 



This Australian cousin of the preceding species has a valve and a harpe equally com- 

 plex, and equally hard to demonstrate ; while the details of the armature seem altogether 

 its own. 



The valve is unusually small; and the presence of many irregular tufts of close long 

 hairs, in unwonted places, greatly conceals and disguises the structure. 



The harpe is, as I have said, very complicated, composed of many pieces, whose forms 

 and positions and directions seem to have no intelligible relation to each other, or to 

 the common object. There appears to run around the terminal portion of the valve a 

 slender chitinous framework, which has two, if not three, projections parallel to each 

 other, one much slenderer and longer than the other, forming a free arch. Down the 

 dorsal side is a thin Avail, rising in the middle into a tall, thin, erect, curved tooth, 

 directed backwards. On the ventral side a ridge runs, within which, near the middle, 

 is a semiglobular plate of deep-brown chitine, having two tall erect incurved faces, 

 the inner forming a simple broad tooth, the outer and opposite cut into many acute 

 serratures. 



The abdominal apparatus, so far as I have been able to resolve it, seems to consist 

 of a very small and compact scapkium, with the uncus (ill-defined) lying close upon it, 

 and a penis moderately produced, reversed, terminating in a swollen extremity and a 

 curved fin ger-p oint . 



These very elegant butterflies appear emphatically and characteristically PapiMones ; 

 yet, in their prehensile armature, they show a manifest approach to those extra-Papi- 

 lionidan families in which the valve and harpe are united to form a single complex 

 prehensor. 



Papilio Codrls, Cram. (Plate XXXIII. figs. 8-12.) 



Valve parallel-sided, circular-ended, fringed with very long, badger-grey, shining 

 hairs. A broad shelf runs obliquely across the end, and narrows down the sides. Near 



