A genus of butterflies of which the following one is most obnoxious to the gardener: -

P. brassica, the large white cabbage butterfly is thus described by Mr. Kol-lar: - "The wings are white; the upper wings with broad black tips, and the female has two black spots on the middle. The under side of the under wings is light yellow. Breadth, when expanded, two inches. It appears from May to October. The caterpillar is bluish-green, thinly haired, and sprinkled with black dots, having a yellow stripe on the back, and the same on the sides. These caterpillars are found, throughout the summer and autumn, on all the sorts of cabbage, on horseradish, radishes, mustard, and similar plants, as well as on water-cresses. The pupae are yellowish-green, with black dots, with a point on the head, and five on the back. The best way to destroy them is picking off and killing the caterpillars, as well as the pupa;, as far as it is possible; the latter are found attached to adjacent trees, hedges, and walls. But care must be taken not to destroy those pupae which have a brown appearance; because they are full of the larva; of ichneumons, and other allied parasites, which are the great scourge of these caterpillars." - Kollar.

P. rapae. Small White Cabbage Butterfly. The following extracts are from the same good authority: - "This Butterfly resembles the foregoing, but is one half smaller; and the black tinge at the points of the uper wings is fainter, and not visible on the outer edge. The time of appearance is the same as of the former.

"The caterpillar is of a dull green, with fine white minute hairs, a yellow stripe on the back, and yellow spots on the sides, on a pale ground. In some years it is very injurious to the cabbage and turnip plants; it also infests the mignionette, which it strips entirely of its leaves. It is very difficult to be discovered from its colour. The pupa is yellowish or greenish-gray, with three yellow stripes. Like the former kind, it is found attached to trees, hedges," etc. - Kollar.