Lepidoptera The Dark Crimson Underwing Moth – Catocala Sponsa
This beautiful insect is represented on Plate XI (fig. 6). It will be observed that the black band crossing the centre of the hind wing is rather broad and sharply bent-an important feature, since it is the most serviceable distinguishing mark between this species and the Light Crimson Underwing (C. Promissa).
The caterpillar is similar in form and habits to those of Fraxini and Nupta, and feeds on the oak. It is full fed about the beginning of June, when it changes to a chrysalis between leaves which it has spun together with silk.
The moth flies in July and August, and is common only in certain oak woods of the southern counties. It is particularly abundant in the New Forest, where scores may be taken in a single night by judicious sugaring.
There yet remain a few small families of the Noctua, but we must leave them in order that we may give a proportionate share of our space to the other great division of the larger moths-the Geometra.