This is one of those anomalous forms, whereof examples occur in every tribe of animals, baffling the skill of the most profound systematists. By Linnæus, and many other authors, it was considered as a butterfly, and certainly the genus Urania (in which it is placed by Latreille), as we learn from Mr. W. S. MacLeay's valuable memoir upon that genus, published in the first volume of the Transactions of the Zoological Society of London, is composed of day-flying species. Fabricius, however, regarded it as a moth, belonging to the genus Noctua, and nearly related to the genus Erebus, of which the Erebus Odora, figured in the third plate of the present volume, is a conspicuous species; and when we examine the structure of the palpi, and the spurs upon the posterior tibiæ, we find good reason for adopting this relation, admitting, at the same time, that the group in question is one which, from its various affinities and analogies, it is very difficult to assign to any single section. {15}CALLIMORPHA PHYLLIRA. Plate VII. fig. 2. ORDER: Lepidoptera. SECTION: Nocturna. FAMILY: Arctiidæ, _Steph._ GENUS. CALLIMORPHA, _Latr. Leach_. Hypercompa, _Steph._ Heraclia, _Hubner_. Phalæna Bombyx, _Drury_. CALLIMORPHA PHYLLIRA. Alis anticis nigris lineis albidis apicalibus, literam B referentibus; posticis sanguineis maculis nigris. (Expans. Alar. 1 unc. 6 lin.) SYN. Phalæna (Bombyx) Phyllira, _Drury, Append. v._ 2. _Olivier, Enc. Méth._ 5. 94. 236. _Abbot and Smith, Ins. Georg. tab._ 64. HABITAT: New York; taken on the 12th day of July. _Upper Side._ The antennæ are black, small, and thread-like, near half an inch long; the head and thorax cream-coloured. Behind the head are two black spots, and on the thorax are three others, longer, and running parallel with it. The abdomen is scarlet, and on each segment is a black mark, forming a row, united together in the middle. All the wings are entire. The anterior ones black, with cream-coloured cilia; the interior edge, and part of the anterior, next the body, are margined with cream colour. A line of the same colour, runs from the body, parallel with, and near to the posterior edge, quite to the external one, where, suddenly returning, in a zigzag manner, it ends at the anterior edge, near the tips, and forms two angles, like a B, with a line placed across its top, or upper part. The posterior wings are scarlet, having a thin border of black, running along their external edges, with four black spots above it, those nearest the abdomen, being in shape like hearts. _Under Side._ Like the upper: but the colours are more faint and less distinct.