Ind. Jour. Vety. Sci. & Anim. Husb. Vol. IX, Part II ]                           PLATE XVIII

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                                     FIG. 1
                              Ventral view of
                          Acanthocolpus luhei

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                                     FIG. 2
                        Ventral view of the genital
                           opening of A. indicum

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                                     FIG. 3
                        Microphotograph of Fig. 2

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                                     FIG. 4
                             Ventral view of
                                A. orientalis