Several other species probably exist, with which I have not happened to meet.
The principal distinctions between Memythrus and Ægeria are, that the antennæ in the former are not longer than the thorax; in the latter they are much longer; in the males of the former genus they are decidedly pectinated, in those of the latter but obscurely ciliated; in the former the anterior wings are always opaque, in the latter always hyaline.
Natural Divisions to which the Sphinx Vespiformis
of Linnæus is referable.
| First Primary Group | ANIMALIA. | |
| First Kingdom | ANNULOSA. | |
| Central Sub-kingdom | INSECTA. | |
| First Class | LEPIDOPTERA. | |
| Central Sub-class | PHALÆNA. | |
| Second Natural Order | COSSI. | |
| Second Family | ÆGERIIDÆ. | |
| Second Genus | MEMYTHRUS. | |
| First Species | VESPIFORMIS. |
FINIS.
R. CLAY, PRINTER, BREAD-STREET-HILL.
DIRECTIONS FOR PLACING THE DIAGRAMS.
1. The Classes of Insecta to face page 21.
2. The Sub-classes of Lepidoptera to face page 31.
3. The Natural Order of Cossi to face page 52.