See pl. 59. ---- The perfect insect, or butterfly, of this elegant species we have already figured at pl. 59 of our second volume: and that our illustration of a form so interesting may be complete, we have now delineated the caterpillar and the chrysalis, as given by Stoll; together with a sprig of the _Cashew_ tree upon which it feeds. Every entomologist, upon looking to the perfect insect, will immediately be struck with its resemblance to the long-winged Heliconian Butterflys, and to the genus _Euploea_, which is the Erycinian type of that family. Now this resemblance, which hardly requires pointing out, is a perfectly natural analogy; and is confirmed in the most remarkable manner by the caterpillar, which puts on that peculiar form which distinguishes _Euploea_. The species in short, in every stage, exemplifies the truth of that fundamental law of nature which we have elsewhere so fully illustrated, viz. "that every _natural_ group, contains representations of ALL others in the same class," following each other precisely in the same series: thus establishing a truth which has long been suspected, but not before demonstrated, that the laws of variation are precisely the same in every group throughout the animal kingdom. The genus itself represents the Swallow-tailed types already figured (_Podalirius_, _Protesilaus_, and _Leptocircus_), but of the three remaining sub-genera of _Marius_, we are as yet ignorant. It is, however, by this genus that the two sub-families of _Paphianæ_ and _Heliconinæ_ are united; as it blends into the latter by means of the genus _Fabius_, which we shall shortly illustrate. * * * * * * [Illustration: ZEONIA _Heliconides_.] ZEONIA Heliconides, _Zeonia Butterfly_. ---- Family Erycinidæ. Sub-family Erycinæ. Genus ----; Sub-genus Zeonia. _Nob._ SUB-GENERIC CHARACTER. Wings trigonal, hyaline, the posterior ending in long tails; Palpi very short, not projecting beyond the head; Antennæ hairy, with the club very small, but gradually thickening from the base. ---- SPECIFIC CHARACTER. _Wings hyaline; the margins, and a common central band black and opaque; inferior wings two-tailed, with a red stripe at the anal angle._ ----