The next type is Sphinx Ligustri; and here again our British collections are obliged to plead poverty; few, however, as they are at present, I am compelled, if I purpose consulting nature, to reduce them about half: the Ægeriæ and Zygænæ must be moved elsewhere; they look like Sphinges, but are none. I will begin then with Castnia, of which no more need be said. The next striking departure from the type occurs in having the abdomen furnished with tufts or brushes, which the insect spreads as it hovers over flowers, somewhat in the manner of a bird's tail. The long porrected antlia also has a resemblance, perhaps rather fancied than real, to the slender bill of a humming-bird, whence the tribe has received with us the name of English humming-birds. The genus Sesia I will place on the circumference of the circle, not doubting but nearer approaches to the Cossi may be discovered, or are even now known, but no better exists among our own Sphinges. The next point of contact will be with Pyralis; and here the genus OEgocera, figured in the Règne Animal, seems to claim its station: it is a decided Sphinx, with the palpi of Hypena proboscidalis, and Latreille has placed it between Sesia and Zygæna, from which it will be seen that I differ only in making Zygæna pass over the boundary line and into the next section. We enter the third sub-class then at Pyralis, and find ourselves among some of the most beautiful little creatures in existence--sylph-like beings, which spend their lives in the brightest sunshine and among the sweetest flowers. Linnæus considered them Sphinges, from what character is not very apparent: the sub-character, applicable only to this section, is certainly correct; they are truly "_larva diversæ_." As for the antennæ being "_medio crassiores_," it is not the case, unless the increase and decrease of pectination can be considered as making them so. Of this particular tribe Latreille observes, "_Les autres lepidoptères de cette division ont dans les deux sexes, des antennes garnies d'un double rang de dents alongées ou bipectinées. Ceux qui out une trompe distincte forment le genre Glaucopis; ceux où cette organe manque ou n'est pas distinct celui d'Aglaope--ces crepusculaires semblent se lier avec les Callimorphes._" The approach of the genus Aglaope to Aglossa, rather than to Callimorpha, seems to be presumable from the circumstance of its not possessing a tongue, the genus Glaucopis having more similarity to our genus Pyrausta, while some of its species, which appear to call for further generic division of the order, are closely allied to our Botys literalis, &c. The only British genera of this order are Zygæna and Ino; the latter, however, appears to be merely a species of some extra-European genus, as I have remarked several exotics of precisely similar form. The insects of this order have a stout and rather hairy larva, much like those of the generality of the sub-class, and in no respect allied to that of the Sphinges.