Fifth report of the United States Entomological Commission, being a revised and enlarged edition of Bulletin no7, on insects injurious to forest and shade trees . minutes he watched its examination the twig was found to contain three such incisures, each reachingmore than half way around. The eggs and mode of oviposition.—Whether or not the cutting of the tips is madeforfeeding purposes, it is evident that it has nothing to do with oviposition, as no trace THE WILLOW CIMBEX. 585 of the eggs could be found either on the dead part of the twig or in the living por-tion just beneath.
Fifth report of the United States Entomological Commission, being a revised and enlarged edition of Bulletin no7, on insects injurious to forest and shade trees . minutes he watched its examination the twig was found to contain three such incisures, each reachingmore than half way around. The eggs and mode of oviposition.—Whether or not the cutting of the tips is madeforfeeding purposes, it is evident that it has nothing to do with oviposition, as no trace THE WILLOW CIMBEX. 585 of the eggs could be found either on the dead part of the twig or in the living por-tion just beneath. The eggs are deposited between the epidermis and paranchymaof the leaf. When looking over the plants from above, the place of oviposition ishardly perceptible, appearing as a very slight blister-like swelling, accompanied onone side by a faint ferruginous line, but otherwise not differing in color from the restof the leaf. On the under side, however, these blisters were very plainly visible,being much paler than the rest of the leaf, and having, in the more developed con-dition, a reddish tinge. These blisters closely resemble those of other saw-flies,. Fig. 194.—Cimbex of the willow: a, leaf containing the eggs; 6, willow twig with incisions ; c, egg;d, yoang larva; e, mature larva; /, coccon; g, the same cut away to show the pupa, h; k, saw of thefly, f. After Kiley. which insert their eggs in leaves and are usually nearly circular in outline (some-times nearly oval), and distinctly elevated above the general surface of the leaf,though otherwise quite flat. They are always on the face of the leaf, usually nearerto the outer margin than to the midrib, never on or near the midrib and rarelyextending across one of the side ribs. Their number varies from one to nine or moreon a single leaf. Where there are several they are generally situated in a longitudi-nal row, the individual blisters being then always separated by the intervening side 686 FIFTH REPORT OF THE ENTOMOLOGIC
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