perfect animals, male and female, fitted for the office of reproduction. In the early spring, the species which are called green tails, from the colour of the bags of eggs in the female, appear in the warm gleams of sunshine which happen in cloudy days, and they then cover the face of the water, and are greedily seized on by the fish. As the season advances they appear principally in the morning and evening. In the heat of summer the phryganeæ are almost nocturnal flies, and seem to have the habits of moths: at this season, now, I should say, the few flies that appear are generally seen in the day-time. The ephemera, another class of flies peculiarly interesting to the fisherman, differ from the phryganeæ in carrying their wings perpendicularly on their backs, and in having long filaments or hairs in their tails. The March brown, (see fig. 8,) the various shades of duns, (see fig. 5, 6, and 7,) which I described to you on a former occasion; the green (see fig. 9 and 10,) and white May fly, the red spinner, (see fig. 11,) are all of the class ephemera. These flies