The specimens above quoted agree well with Cramer’s figures. The female from the Sulla Islands differs only in having more yellow towards the anal angle of the lower wings. The specimens figured by Cramer in pls. 10, 11, under the name of “_Hypolitus_” seem to be a remarkable variety, in which the female has much of the character of the male. Messrs. Doubleday and G. R. Gray have adopted _Panthous_ as the specific name of this insect; but this name was first used by Linnæus for the female of _Priamus_ only, in the 10th ed. of the ‘Systema Naturæ’ (1758). Clerck (in 1759) adopted the name, but supposed he had found the male in the female of _Remus_. Linnæus, in Mus. Lud. Ulric. (1764), and in the 12th ed. of the ‘Systema Naturæ’ (1766), adopts this error, so far as referring to Clerck’s two figures; but in both these works his description refers only to the female of _P. Priamus_, indicating that the supposed other sex (_P. Remus_) was not known to him personally. The name of _Panthous_ must therefore altogether drop, it having been applied to this species only through a double error—first, that of Linnæus, in supposing his _Panthous_ to be distinct from _Priamus_, and then that of Clerck, in thinking that a female _Remus_ was the male of the Linnean _Panthous_. 7. ORNITHOPTERA HELENA, Linnæus. ♂. _P. Helena_, Cram. Pap. Ex. t. 140. f. A, B. _O. Helena_, Boisd. Sp. Gén. Lép. p. 177. ♀. _P. Amphimedon_, Cram. Pap. Ex. t. 194. f. A. _O. Amphimedon_, Boisd. Sp. Gén. p. 176. _Hab._ Amboyna and Ceram (_Wall._). The females from these localities are always sooty, with the spots and markings on the hinder wings of a dull buff-colour even in the freshest specimens. _a._ Local form _Bouruensis_.—_Male_: exactly resembles the Amboyna specimens, except that the yellow patch is more variable in form and extent. _Female_: nearly black, and with the markings on the lower wings almost as pure and deep yellow as in the males: size a little smaller than in the type. _Hab._ Bouru (_Wall._). _b._ Local form _Papuensis_.—_Female_: sooty black, the two first branches of the subcostal nervure margined with whitish near their origin; markings of the lower wings of the same tint of orange-yellow as is _O. Helena_ ♂, but not so glossy. _Male_ not known. _Hab._ New Guinea, Salwatty (_Wall._). _c._ Local form _Celebensis_.—_Male_: wings a little more pointed than in _O. Helena_; yellow patch of lower wings extending nearer to the posterior margin, and bounded towards the abdominal margin by the first branch of the median nervure. Beneath, having the nervures between the discoidal cell and the outer border ashy-margined. _Female_ not known. _Hab._ Macassar (Celebes) (_Wall._).