1)ITliGAUAS M U K E R J I A E D M. A. HAKTM HTIUYA Drpni t nimt of Zo,oloyy, Unzversity of Calcutta ELEVES TEXT FIGORES AND THREE PLATES (SEVENTEEN FIGKRES) .ITTHOIIS' .4l3CTRACT The reproductire organs of Ururhris quadrirnarulatus Fahr.. and R. ((Mlosohrurhus) chinensis L., iiirludiiig Iristolory are desrrihrd in detail. The role of the diffrrmt parts of the male and female copulatory apparatus i s discussed and the physical composition and fnnctiori of the srrretioris o f the accessory glands are indicated. The specific differences in the struzturr of thr genitalia of the two species are shown.