IN CERTAIN LEPIDOPTERA. 311 



Xow the genital armature, in these widely severed forms, is essentially the same. 

 Of that from Jamaica, and that from Corricntes, I have received a considerable number 

 of examples, taken at different times by my own friends ; so that I am sure of the habitats. 

 The Jamaican specimens have the isolate knob of the harpe three-sided or concave, 

 the main spine slightly curved, and with but one baseward elevation. The Androgeos 

 from Brazil, and several Polycaons from Corrientes, show absolutely no difference inter se. 

 The characters are constant, so far as my experience goes. 



The precision with which this very peculiar harpe is repeated in these widely spread 

 varieties is something noteworthy. It suggests the notion that, in this organ, we have 

 a specific character of much value. Androgeos, Thersites, Polyraon,xmA. Lycophron, are 

 assuredly but a single species. 



Papilio Axiox, Boisd. (A. D.) (Plate XXX. fig. 20.) 



The armature of this noble butterfly is remarkable. The voice is almost as large as 

 that of an Ornithoptera, and of similar shape, viz. semioval, or of the outline of a half 

 lemon cut obliquely, the dorsal side by far the shorter, as usual. Exteriorly, the valve 

 is clad with dull white scales, which become black at the dorsal edge, and these pro- 

 ject pretty evenly beyond the margins. Interiorly, it is umber-brown, with a dull 

 gloss. 



Prom one specimen, on removing a valve for examiuation, the whole cavity was 

 fouud quite full of a light brown dust, composed of amorphous fragments (of meconium, 

 surely), together with a considerable number of fine hair-like scales, such as are proper 

 to the hinder regions, gathered, I doubt not, from the body of the female during an act 

 of coition. 



The harpe belongs to the pattern of Thous and Turnus. It is an ample plate of thin 

 glassy chitine, which closely lines the greater part of the entire cavity ; yet can be easily 

 separated from it, in its integrity, when it is a curious and attractive object. It is a 

 broad hollow plate, of exquisite delicacy and tenuity, translucent, slightly tinged with 

 horn-yellow, the extreme edge, all round, thickened and deepened in colour, polished, 

 ■ and furnished at two points with two long, taper, curved, acute spines, much resembling 

 the prickles of a rose in form, colour, and polish. Both are on the ventral margin, the 

 one just below the apex of the valve being the proper prehensor, laterally opposable, 

 conjoined with its fellow in the other valve, to the uncus. Besides these spines, there 

 are several minuter ones on the dorsal edge, the chitine rising here into a thin wall, 

 which is cut into teeth, three or four, the number and arrangement being not quite 

 the same in two individuals that I examined. The form of the whole harpe varies also ; 

 for while, in the specimen figured, which was the first I examined, the apical arch was 

 somewhat flattened (as represented), in a subsequent example the outline was much more 

 graceful, more nearly corresponding to that of the valve, and so more closely resembled 

 the form in Thoas and Turnus. 



The penis appears to be small, short, and curved into a semicircle ; but it was so closely 

 enveloped in its ligaments, that I could not very satisfactorily examine it. 



The uncus with its concomitant parts presented nothing specially notable. 



