. Annual report - Entomological Society of Ontario. Entomological Society of Ontario; Insect pests; Insects. 45 we are indebted to the unceasing vigilance of tkese tiny insect friends for the comparative rarity of this insect pest. THE CLOVER-LEAF MIBG^—Cecidcmiyia trifolii. This is a European insect which has been recently discovered in this country. It- has been studied at the Department of Agriculture in Washington, and reported on by Prof. Comstock. Although we are not aware of its occurrence as yet in Canada, we submit a brief sketch of its history condensed from the repoii: of the entomo
. Annual report - Entomological Society of Ontario. Entomological Society of Ontario; Insect pests; Insects. 45 we are indebted to the unceasing vigilance of tkese tiny insect friends for the comparative rarity of this insect pest. THE CLOVER-LEAF MIBG^—Cecidcmiyia trifolii. This is a European insect which has been recently discovered in this country. It- has been studied at the Department of Agriculture in Washington, and reported on by Prof. Comstock. Although we are not aware of its occurrence as yet in Canada, we submit a brief sketch of its history condensed from the repoii: of the entomologist at Washington. It attacks the leaf of the clover, and in fig. 17 we have represented the folded leaves con- taining the larvse, a partially-opened leaf-case sho\ving the cocoons attached to the leaf, and the larva and female midge both enlarged. The fly so closely resembles the clover seed midge that it can scarcely be distinguished from it excepting by critical examination ; it is a little smaller in size, and the female has two joints less in her antennje. It attacks both thfe red and white clover. About the middle of June is the time when the larva is found ; it folds the leaflets together upon the mid-rib so that the two edges almost coincide. The under side of the folded leaves turn yellow or brownish, and upon opening them they are found to contain from one to twenty whitish or pale orange-coloured larvae, much like those of the clover seed midge, but somewhat smaller and paler in colour, with the whole surface of the body coarsely granulated. Within the folds the larvje change to chrysalids, enclosed in delicate white oval cocoons fastened to the sides of the leaf. The enclosed chrysalis is of a pale orange colour, with a median ventral stripe of a darker shade. This insect is not yet reported as occurring in any other locality than Washington ;. should it much extend its operations and become generally common, or even abundant, it is not likely, from the nature
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