Forest entomology . boreal Lepidoptera, to give toomany details of the larger-sized sub-families. Students, however, as ageneral rule, may divide the order into two principal sections—viz.,.MatTO-Lepidoptera and iHzcro-Lepidoptera. The former deals withthe larger-sized species, and the latter with the smaller or very tinycreatures. In the smaller-sized moths or iliz^ro-Lepidoptera it is essential in LEPIDOPTERA. 243 some sections to give considerable attention to generic characters, asin certain cases the whole genus may not only be arboreal in habits,but as the characters are minute, microsco
Forest entomology . boreal Lepidoptera, to give toomany details of the larger-sized sub-families. Students, however, as ageneral rule, may divide the order into two principal sections—viz.,.MatTO-Lepidoptera and iHzcro-Lepidoptera. The former deals withthe larger-sized species, and the latter with the smaller or very tinycreatures. In the smaller-sized moths or iliz^ro-Lepidoptera it is essential in LEPIDOPTERA. 243 some sections to give considerable attention to generic characters, asin certain cases the whole genus may not only be arboreal in habits,but as the characters are minute, microscopical examination of thesalient features is indispensable. Smeiunthus populi (Linn.) (Poplar Hawk-Moth). This moth, as the name implies, is found on the poplar. It is notso abundant as ever to be considered a pest, though fairly common asan entomological specimen. The larva lives on Lombardy and blackItalian poplars. The moth appears about midsummer. The eggs are deposited on the upper side of the leaves. They are. Fig. 223.—Smerinthus populi {Poplar Hawk-Moth). large and nearly globular, pale green in colour, and glued singly tothe leaves. The embryo may be seen before hatching. The larvae hatch out about the beginning of July, and the longcaudal horn projecting from the last segment is quite a conspicuousfeature. As development proceeds the horn is less conspicuous, butstripes, spots, and markings on the lateral segments may be noticed,and after the respective moultings the larvae develop a short, stout,yellow, caudal horn, and it is interesting to note the changed markingsin comparison with the green colour of the leaf. The moth, fig. 223, is a large heavy insect of a stone-greycolour, with a whitish spot on the fore wings and a brick - redblotch on the hind wings. The wings are notched at the margins,and the venation is fairly conspicuous. The body is soft andvelvety - looking. The antenna? are serrated in the $, nearlyfiliform in the $. 244 FOREST ENTOMOLOGY. Smerikthu
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