A study of the American genus Lagoa in its various stages of growth shows a manifest approach to the present group, so that we are warranted in following the Dasychirinœ with the Cochliinœ. This sub-family is remarkable for its peculiar larvæ, called “slug caterpillars” or “saddlebacks.” The first name is given on account of their snail-like appearance, the form being elliptical or oval, the false feet replaced by swellings on the abdominal segments, so that the larva lies flat and close tothe leaf. The head is also retractille.