Triphaenia pronuba. Yellow Un-derwing Moth. Mr. Curtis says that "its caterpillar is hatched in July or August, and if the egg has been deposited in a cabbage or cauliflower, the young larva immediately eats its way to the centre, on which it feeds till it is full grown, when it is about two inches long, greenish or brownish green in colour, with two rows of black spots on the back. During the winter, it lies beneath stones or clods of earth, and in April or May it descends a few inches below the surface, where it changes to a reddish pupa, from which the perfect moth emerges in June or July. The moth varies in size from two to two and a half inches: the upper wings are brownish or grayish, with an indistinct kidney-shaped spot near the centre; the lower wings are bright yellow, with a narrow black band. The moth varies considerably in its colour and markings, scarcely two individuals ever being exactly alike. The caterpillar, though it most frequently is found on the cabbage or cauliflower, yet sometimes does considerable mischief to celery, and even the young leaves and flower-buds of auriculas, primroses, and violets are destroyed by it.

The only remedy we can suggest is to search for and destroy them." - Gard. Chron.