As the above genus at present stands, it contains many insects which have but little affinity to each other, as may be seen by comparing the present figure with that on the following plate, both of which have been usually assigned a place in it. If we have not altered this arrangement, it is not because we do not regard it as improper, but from a reluctance to introduce many partial changes, in a place where it would be irrelevant to enter at length on the general subject of classification. The relation which groups bear to each other can be satisfactorily shown only by treating of the whole; and insulated changes are the less desirable at present, as a general arrangement of the whole class will speedily be laid before the public by an individual who has long directed his attention to the subject. The above-named species belongs to a group in which the upper wings are triangular, and the inferior very much elongated, truncated towards the anal angle, and exteriorly drawn out into a long narrow tail. With the exception of the dark bands and occasional crimson spots, the whole wings are transparent. _E. octavius_ expands about an inch and a half. The upper wings are transparent, the whole of the outer margin, and a band running obliquely across the middle, black. Under wings transparent anteriorly, the remainder, including the tail, black; the anal angle with a large crimson patch. The tail is very narrow, and somewhat whitish on the outer edge and at the tip. The under side resembles the upper, except that the red spots are each marked with two white points. Found in Surinam. [Illustration: PLATE 25. _1. 2. Erycina Melibaeus._ _3. Loxura Alcides._ 1 & 2 from Brazil. 3 Africa. _Lizars sc._] ERYCINA MELIBÆUS. PLATE XXV. Figs. 1 and 2. Pap. E. A. Melibæus, _Fabr._--_Herbst. Pap._ Pl. 59, fig. 4, 5.--Pap. Pyretus, _Cramer_, Pl. 144, fig. A, B. This beautiful insect belongs to that division of _Erycina_ which has opaque wings, and a short obtuse tail to the hinder pair. It is about two inches in extent of wing. The surface is uniform dark brown, with a bright red oblique band running across the middle of both wings, and a large crescent of the same colour near the origin of the tail. On the inner side of the upper wings there is the appearance of another oblique red band, but it is obsolete except at the hinder margin. The under side forms a striking contrast with the surface, the ground colour being black, with two brilliant blue bands, the outer one very broad, the interior somewhat macular, and terminating behind in a red point. Body brown above and black beneath. Like most of the species constituting the genus _Erycina_, it is a native of the new world, occurring in greatest plenty in Surinam and Brazil. LOXURA ALCIDES. PLATE XXV. Fig. 3. Pap. P. R. Alcides, _Fabr. Mant._--Hesperia, R. Alcides, _Fabr. Syst._--Pap. Alcides, _Cramer_, Pl. 96, fig. D, E.--Myrina Alcides, _Godart_.