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298 in most of the other orders, and all the accessory parts are strongly developed.

These, and other parts of the oral appendages, are represented on Pl. XXVI.

The variations of the antennæ are too numerous to be specified in this place. The number of joints is from three (their amount in Hylotoma) to about fifty. These multiarticulate antennæ are chiefly to be found among the Ichneumonidæ, whose economy renders it necessary that they should be very flexible for the purpose of exploring the holes and crevices into which they introduce their eggs. In some instances the antennæ are bipectinated; in other cases (as in Cryptus) they appear double, the third joint being long and furcate. They are often very dissimilar in