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Rh Closely associated with the reproductive organs of the female is the sting; this is a barbed dart connected with a poison gland, whose use is well known.

In the abdomen of the male there is a pair of organs, the testes, in which the spermatozoa are developed. These correspond in position to the ovaries of the female, but are much smaller. From each testis there extends a tube corresponding to the oviduct, this is the vas deferens. The two vasa deferentia unite and form the single ejaculator duct. Each vas deferens is enlarged just before it joins the ejaculatory duct, forming a reservoir for the accumulation of spermatozoa; these reservoirs are termed the seminal sacs. Appended to each seminal sac there is a large glandular sac, hich adds mucus to the seminal fluid. Near the outer end of the ejaculatory duct there is a pouchlike enlargement into which the spermatozoa pass. Here they are massed into a compact body, known as the spermatophore, which is transferred to the female at the time of pairing. The terminal part of the reproductive organs of the male, the intermittent organ, has several appendages, which are firmly grasped in the opening of the reproductive organs of the female and are torn from the male when the two pairing individuals separate. This causes the death of the male. The male has no sting. (Plate XXVI, Fig. 2.)