( 472 ) 



comj)aniig f. 55, 50, and 62, 63, with f. 52 to 54 and 50, 60 respectively. In 

 outline the longitudinal ridge is on the whole not different from that of New Guinea 

 examples, but the usual form of the ridge is not that represented in f. 56, whicli 

 is similar to f. 52, representing the usual form of the ridge iu eiichcnor ruclienor, 

 liut a form resembling f. 55. In tlie latter figure there is an additional tooth ujion 

 the crown of the basal dilatation of the ridge, which we have seen only in this one 

 individual. The veutri-apical hook is in the specimens examined shorter than in 

 euchenor euclienor. The vertical ridge (f 62 and 63) shows a certain amount of 

 variability in the dentition. The ventri-apical hook ajipears to be somewhat more 

 curved towards the right-hand side than in f. 59 to 01 ; this is due to the hook 

 being more erect than in euchenor euchenor, less leaning over ventrally and apically. 

 From the Kei Islands three individuals have been examined which, in external 

 features, do not exhibit obvious differences from the Ara specimens in the Tring 

 Museum. The harpe presents, however, in the three examples some slight distin- 

 guishing characters. The longitudinal ridge is (f. 57) still shorter than in Am 

 individuals, the ventri-apical hook stands still more erect to the plane of the valve 

 and the upper edge of the ventral ridge (as will be seen both from f. 57 and 

 f. 04), and the vertical ridge (f. 04) is provided with many strong teeth. 



8. Papilio depilis; f. 05 to 71. 



The valve is ventrally a little more rounded than in P. euchenor, Init this 

 character is not constant. The armature of the va_lve (f 05) is, however, obviously 

 different. A comparison of f. 51 and 05 will show that the valves with the 

 armature arc in both species closely related ; there are the same folds, ridges, and 

 hooks in depilis which we have found in euchenor, but the organs have differently 

 developed. The ventral (longitudinal) and ajiical (vertical) ridges of euchenor 

 stand in depilis both so oblique that the angle formed by them in euchenor has 

 almost disappeared. The ventri-apical hook does not lean over to the ventri-apical side 

 of the valve, but to the dorsal side, so that the point of the hook will in depilis meet 

 in copulation iinite a different spot in the vaginal region of the femnle. than in 

 euchenor. The dentate vertical ridge is much shorter (f. 70, 71), sinuate iu or 

 near the middle, with the two higher parts at the side of the sinus dentate. The 

 oblique fold (f/) joins the ventral ridge near the apex (f. 66 to 69), not in the 

 middle as in f. 52 to 58, and is basally not rounded but strongly compressed. 



a. P. depilis depilis; f. 05 to 07, and 70. 



The ventral ridge is throughout its length very high; its outline is variable. 

 In f. 60 the ni)per edge of the ridge is undulate; the basal angle (e) is without 

 the beak-like hook found in every specimen of euchenor. In a second individual 

 (f. 67) the basal hook is indicated by a very minute tooth: in the middle the 

 ridge is triangularly dilated. In a third specimen (not figured) the ridge is again 

 without the basal hook, and is in the middle also higher than at the basal angle, 

 but not so triangularly dilated as in the second example. 



The ventri-dorsal dentate ridge (f. 70) leans strongly over tcT tlie apical 

 side of the valve, and hence ap])ears less high than in euchenor, but there arc 

 specimens of euchenor which in this respect are scarcely different from depilis. 

 Besides the dorsal hook («) there are three longer subdorsal and two smaller sub- 

 ventral teeth separated by a sinus; in a second specimen these teeth are all obsolete, 

 while in a third only two are present. 



