The pale or yellow coloured species of Gortyna, the caterpillars being internal feeders, pupating, however, in the ground, prepare us for the Nonagriini. We have, however, in North America, a pecculiar tribe which I have called Arzamini, and which I here interpolate. The caterpillar was first discovered by Prof. Comstock in Florida Lakes, in the leaf-stalks of the pond lily. This was the larva of A. vulniflca var. melanopyga, and subsequently in the lake at Ithaca, the larva of the typical vulnifica was observed by the same distinguished entomologist.