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But few of our economic insects have been studied more than the common pear-slug or cherry-slug saw-fly, Caliroa cerasi Linn., yet concerning some points in its biology and life history we are as yet in doubt. Parthenogenesis, known to occur in some of the saw flies, has been suspected in the case of this species, but does not appear to have been sufficiently proved. Mr. R. L. Webster, in his bulletin on this pest* presents a good account of its biology and life history, but in regard to parthenogenesis (complete and successful) he states that it had not been sufficiently proved, yet some important observations were made which are mentioned in this paper. *Webster, R. L. The Pear-slug. Bul. No. 130, Iowa Agric. Exp. Sta. (1912).
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