. Annual report - Entomological Society of Ontario. Entomological Society of Ontario; Insect pests; Insects. 59 Plagiodera lapponica, Linn., is more elongated and flattened than species of the genus Chrysomela. It is one-fourth of an inch long ; black; the elytra, orange with black spots, and is found upon alders and willows. The larva is of a dingy yellowish- white colour, with black head and legs. Upon the sides and back are rows of small dusky tubercles ; the outer-dorsal rows being more distinct and capable of emitting from their tips a milky, pungent fluid. P. Scripta, Fab., a very closel
. Annual report - Entomological Society of Ontario. Entomological Society of Ontario; Insect pests; Insects. 59 Plagiodera lapponica, Linn., is more elongated and flattened than species of the genus Chrysomela. It is one-fourth of an inch long ; black; the elytra, orange with black spots, and is found upon alders and willows. The larva is of a dingy yellowish- white colour, with black head and legs. Upon the sides and back are rows of small dusky tubercles ; the outer-dorsal rows being more distinct and capable of emitting from their tips a milky, pungent fluid. P. Scripta, Fab., a very closely allied species, (by some held to be but a variety of the last) has proved itself a very destructive insect in the Western States; especially in the prairie regions, where it has become a grievous pest on account of its depredations on the cottonwood. This tree is grown very extensively as a shade and ornamental tree, and for fuel, and vast groves are stated to have been utterly destroyed by repeated de- foliations. The eggs are laid in clusters, of from ten to one hundred, on the young leaves in the spring and quickly develop. There are two or three broods during the summer. Monocesta coryli, Say., (corylus being the latin for a hazel, or filbert tree,) is known in the United States as the Great Elm-leaf Beetle, and is occasionaly very destructive to the red or slippery elm. Its eggs are laid on the under side of the leaves in J une, and from them issue in a few days brown, or yellowish brown larvae, which, growing rapidly, " eat the leaves into ; About the end of July they enter the ground and pupate. The genus Diabrotica contains a number of species, of which D. vittata, Fab., the Striped Cucumber Beetle, is a well-known gardener's pest. It was well figured and described in the Report of 1878. The little lemon-yellow bettle (Fig. 70), with a black head and three black stripes on the wing-covers, makes its appear- ance as cucumbers, squashes and melons commenc
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectinsects, bookyear1872
