Abstract In the crystals of the title compounds, C8H16N2S4,(I), and C! 0H20NeS4,(II), the molecules lie about inversion centres. In both structures, the C: S bonds in the two dithiocarbamate units are oriented trans to each other. In (I), the ethylene bridge and the bridged S atoms adopt a trans planar conformation and form a dihedral angle of 84.4 (2) with the dimethyldithiocarbamate plane. The molecule of (II) is nearly planar; in the crystal, ...