When the Kalmia, Rhodora, and wild cherries are in bloom, many of our most beautiful butterflies appear; such are the different species of Chrysophanus (Fig. 227), Lycaena, Thecla and Argynnis (Fig. 228). At this time we have found the rare larva of Melitaea Phaeton (Fig. 229) clothed in the richest red and velvety black, feeding daintily upon the hazel nut, and tender leaves of the golden rod. In June, it changes to the chrysalis state, and early in July the butterfly rises from the cold, damp bogs, where we have oftenest found it, clad in its rich dress of velvety black and red. Later still, when the lilac blooms, and farther south the broad-leaved Kalmia, the gaily-colored Humming Bird moth (Sesia) visits the flowers in company with the Swallow-tail butterfly (Papilio Turnus). At twilight, the Hawk moth (Sphinx) darts noiselessly through our gardens, as soon as the honeysuckles, pinks and lilies are in blossom. [Illustration: 230. D. 12-punctata.] [Illustration: 231. Diabrotica vittata.] Among the flies, mosquitoes now appear, though they have not yet, perhaps, strayed far from their native swamps and fens; and their mammoth allies, the Daddy-long-legs (Tipula), rise from the fields and mould of our gardens in great numbers. [Illustration: Fig. 232. Plum Weevil and Young.] Of the beetles, those which feed on leaves now become specially active. The Squash beetle (Diabrotica vittata, Fig. 231, and Fig. 230, D. 12-punctata) now attacks the squash plants before they are fairly up; and the Plum weevil (Conotrachelus nenuphar, Fig. 232) will sting the newly formed fruit, late in the month, or early in June. Many other weevils now abound, stinging the seeds and fruit, and depositing their eggs just under the skin. So immense are the numbers of insects which fill the air and enliven the fields and woodlands just as summer comes in, that a bare enumeration of them would overcrowd our pages, and tire the reader. [Illustration: 233. May Fly.] A word, however, about our water insects. Late in the month the May fly (Ephemera, Fig. 233) appears, often rising in immense numbers, from the surface of pools and sluggish brooks. In Europe, whole clouds of these delicate forms, with their thin white wings, have been known to fall like snow upon the ground, when the peasants gather them up in heaps to enrich their gardens and farms. The Case worms, or Caddis flies (Fig. 234), begin now to leave their portable houses, formed of pieces of leaves, or sticks and fine gravel, or even of shells, as in an European species, and fly over the water, resting on the overhanging trees.