[69] [In his recent revision of the _Sphingidæ_, Mr. A. G. Butler (Trans. Zoo. Soc., vol. ix. part x.) retains Walker’s arrangement. R.M.] [70] The deposition of black pigment may commence immediately before ecdysis. [71] [Mr. Herbert Goss states (Proc. Ent. Soc. 1878, p. v.) that according to his experience, the green and brown varieties of _C. Porcellus_ (erroneously printed as _Elpenor_ in the passage referred to) are about equally common, the former colour not being in any way confined to young larvæ. Mr. Owen Wilson in his recent work, “The Larvæ of British Lepidoptera and their food-plants,” figures (Pl. VIII., Figs. 3 and 3a) the two forms, both apparently in the adult state. During the years 1878-79, my friend, Mr. J. Evershed, jun., took five of these full-grown larvæ in Surrey, one of these being the green variety. In order to get more statistics on this subject, I applied this year (1880) to Messrs. Davis of Dartford, who informed me that among 18-20 adult caterpillars of _Porcellus_ in their possession, there was only one green specimen. R.M.] [72] I unite the genera _Pergesa_ and _Darapsa_ of Walk. with _Chærocampa_, Dup.; the first appears to me to be quite untenable, since it is impossible that two species, of which the caterpillars agree so completely as those of _C. Elpenor_ and _Porcellus_, can be located in different genera. _Porcellus_ indeed was referred to the genus _Pergesa_ because of its different contour of wings, an instance which distinctly shows how dangerous it is to attempt to found Lepidopterous genera without considering the caterpillars. The genus _Darapsa_ also appears to me to be of very doubtful value, and in any case requires further confirmation with respect to the larval forms. [73] [Mr. A. G. Butler (Trans. Zoo. Soc., vol. ix., part. x., 1876) gives a list of about eighty-four species of _Chærocampa_, and sixteen of _Pergesa_, besides numerous other species belonging to several genera placed between _Chærocampa_ and _Pergesa_. Of _Darapsa_, he states “that this genus was founded upon most heterogeneous material, the first three species being referable to Hübner’s genus _Otus_, the fifth to Walker’s genus _Diodosida_, the sixth and eighth to the genus _Daphnis_ of Hübner, the seventh, ninth, and tenth to _Chærocampa_ of Duponchel; there therefore remains only the fourth species, allied to _Chærocampa_, but apparently sufficiently distinct.” The species still retained in the genus _Darapsa_ is _D. rhodocera_, Wlk., from Haiti. R.M.] [74] [_Otus Syriacus_ of Butler’s revision. R.M.] [75] Abbot and Smith. “The Natural History of the rarer Lepidopterous Insects of Georgia, collected from the observations of John Abbot, with the plants on which they feed.” London, 1797, 2 vols. fol. [76] [_Otus Chœrilus_ and _O. Myron_ of Butler’s revision. R.M.]