Of the genus _Chærocampa_,[72] over fifty species have been described,[73] of which the larvæ of only fifteen are known in the form which they possess at the last ontogenetic stage. GROUP 1.--I can furnish but little information with respect to this group. The first species with which I became acquainted was _Chærocampa Syriaca_,[74] of which I saw two blown caterpillars in Staudinger’s collection, and which I have figured in Pl. IV., Fig. 29. The larva is green, and has the short oblique stripes over the legs common to so many species of _Chærocampa_, the only marking besides these being a simple white subdorsal line, without any trace of eye-spots. This species exactly corresponds therefore with the second ontogenetic stage of _C. Elpenor_ and _Porcellus_. The account of the species, both in the larval and perfect state, is unfortunately so imperfect, that we cannot with certainty infer the age of the two caterpillars from their size. If the moth were of the same size as _Elpenor_, then the caterpillar figured, having a length of 5.3 centimeters, would not be in the last but in the penultimate stage, and it remains doubtful whether it may not acquire eye-spots in the last stage. That species exist, however, which in their last stage correspond to the second stage of _Elpenor_, is shown by two of the forms belonging to Walker’s genus _Darapsa_, which was founded on the characters of the imagines only. Ten species of this genus are given in Gray’s catalogue, the adult larva of two of these being known through the excellent figures of Abbot and Smith.[75] These two caterpillars possess the characteristic tapering form in a very marked degree; one is figured in the attitude so often assumed by our species of _Chærocampa_ on the approach of danger, the three front segments being withdrawn into the fourth. (Fig. 34, Pl. IV., is copied from this Plate). There are no eye-spots either in _D. Myron_ or _D. Chœrilus_,[76] but only a broad white subdorsal line; underneath which, and to a certain extent proceeding from it, there are oblique white stripes, precisely similar to those which meet the subdorsal line in the third stage of _C. Porcellus_.[77] GROUP 2.--This group contains numerous species which, like our native _C. Elpenor_ and _Porcellus_, show eye-spots on the fourth and fifth segments, whilst these markings are absent, or at most only present in traces, on the remainder. To this section there belong, besides the two species mentioned, five others, viz. in Europe, _C. Celerio_ and _Alecto_ (not certainly known?);[78] in India, _C. Nessus_, Drury, and _Lucasii_, Boisduval;[79] and an unnamed species from Port Natal.