Fifth Report of the United States Entomological Commission: Being a Revised and Enlarged Edition of Bulletin No. 7, on Insects Injurious to Forest and Shade Trees

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U.S. Government Printing Office, 1890 - 957 pages
 

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Page 336 - ... as large as the median lobes, elongated, and with one or two notches on the lateral margin; the third lobe is still smaller and pointed, or is obsolete. There are two pairs of incisions of the margin, one between the first and second lobes of each side, and one between the second and third lobes ; they are small, but are rendered conspicuous by the thickenings of the body wall bounding them. The plates are simple, inconspicuous, and resemble the spines in form. The larger ones are situated one...
Page 356 - For a time they cast their chips out of the holes as fast as they are made, but after a while the passage becomes clogged and the burrow more or less filled with the coarse and fibrous fragments of wood, to get rid of which the grubs are often obliged to open new holes through the bark. The seat of their operations is known by the oozing of the sap and the droppings of the sawdust from the holes.
Page 846 - ... the first and second weeks of July. Of course it is desirable that the caterpillar be reared, so as to leave no doubt as to its identity with the moth in question. When the young trees and shrubs are found to be affected, they should be sprayed with Paris green or London purple in solution. THE COMMON LONGICOEN PINE-BOEEB.
Page 270 - ... composed of a slight web of silk intermingled with a few hairs. They remain in the cocoons in the chrysalis state through the winter, and are transformed to moths in the months of June and July. These moths are white, and without spots; the fore thighs are tawny yellow, and the feet blackish.
Page 731 - ... trees, has proved fatal. In July the worm spins a whitish, thin, papery cocoon in the mass of exuding pitch, which seems to act as a protection to both the larva and the chrysalis.
Page 632 - ... leaf on each side of the midrib, and at right angles to it, so that the leaf may be folded together. Before beginning to roll up the leaf she gnaws the stem nearly off, so that after the roll is made, and has dried for perhaps a day, it is easily detached by the wind and falls to the ground. When folding the leaf, she tightly rolls it up, neatly tucking in the ends, until a compact, cylindrical solid mass of vegetation is formed. Before the leaf is entirely rolled she deposits a single egg, rarely...
Page 274 - ... devour. Pear-trees are particularly subject to their attacks, but the elm, hickory, poplar, oak, and probably also other kinds of trees, are frequented and injured by them.
Page 418 - ... prolongations being much thickened and joined at their distal extremities. This thickening of the body wall extends anteriorly for a short distance upon both the dorsal and' ventral sides of the body, but chiefly upon the former. The number of these lobes varies from one to four pairs. In some species a part of the lateral margin of the segment appears to be of the same structure as the lobes. In certain species thickenings of the body wall occur near the prolongations of the lobes but more or...
Page 431 - ... generally got the poison to prevent their attack upon the aftergrowth. Still the young leaves became perforated to some extent. The adults, which fly from tree to tree, appeared plentiful without much interruption throughout the season, and often several could be seen feeding on each tree. Possibly many of these may have become poisoned before depositing the eggs. "The efficiency of London purple being...

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