The sixth and last of the exterior sub-classes is Geometra, and we shall find one insect which is completely a Geometra, and yet in the larva has two additional feet, and the abdominal fringe of Catocala: this is Metrocampus margaritaria,[40] an insect, without which the connexion of these sub-classes would have been difficult to establish. The next species I am acquainted with seems to be Rumia cratægaria, and after it the Thorn moths, as they are termed (Crocallis?): these lead to Geometra[41] in the centre, which may be considered the farthest removed from any of the surrounding sub-classes; from the genus Geometra a line may be drawn through Biston, Nyssia, and Hybernia, to the point of contact with Phalæna in the centre, and another through Boarmia, Abraxas, and Ourapteryx to Urania, from which genus of Papiliones perhaps the reader will recollect we set out. [40] Of Mr. Curtis's _Guide_. I cannot consider fasciaria, Mr. Curtis's next species, at all allied. [41] Alcis. Curtis. The seventh and central sub-class, Phalæna, now claims our attention. The mere circumstance of having taken a little tour round it gives but a very poor idea of its contents, and although my reader may assure me he knows them sufficiently well already, that assurance will by no means satisfy me that he and I are at all agreed either as to what those contents may be, or as to their relative situations. Before, however, I again set in earnest to the task of pointing out relations and approaches, I feel that some apology is due for attempting the restoration of a beautiful and euphonious name to that grand group of Lepidoptera, to which it was originally assigned by the eminent naturalist who was the first to define and name such groups.[42] I am fully aware this is an attempt at innovation for which I can never be forgiven by the scientific; for the merit of the present day seems to consist in the total neglect of grouping and classifying, and in making a host of imaginary genera and species, for the mere pleasure of overwhelming us with a "farrago" of barbarous and unutterable names,--a practice which my unsophisticated and old-fashioned notions will never dwell on with that deferential awe which such profound science has an undoubted right to expect. [42] Linnæus. Again, on the subjects of _orders_, a term I have already been induced to use now and then, I am quite aware that I here am guilty of another misdemeanour, and more especially as I call them natural orders, meaning thereby orders among the contents of which nature has established the similarity; and to the formation of which "the cunningly devised fables" of man have contributed but very little; and meaning also that nature has implanted in us all, more or less, the power of distinguishing such orders by a mere glance, and without any reference to our books.