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192 by the Dragon-flies, which have them so prominent that they are sometimes supposed to be stings. By means of them the male is enabled to retain the female, and even fly about with her in such a position as to have given rise to the erroneous notion that the genitalia in these insects are placed in the anterior part of the body. In this respect they form no exception to the general rule.

Fig. 4, generative apparatus of the male of Hydrous piceus; a, a, testes, b, b, vasa deferentia, c, c, principal seminal vessels, e, e, e, e, various accessory vessels, f, ejaculatory duct, dilated in the middle, g, copulative armature of the vagina. Fig. 5, testicle of Silpha obscura greatly magnified.

.—When we reflect on the varied movements of insects, their different modes of progression, walking, leaping, swimming, flying, &c. and the great degree of strength which they exhibit,