M.  NISHIKAWA, ?Occurrence of a New Apterous Species of Ptomaphagus (Coleoptera, Cholevidae) in Taiwan?, ELtk, vol. 21, pp. 123-128., 1993.

M.  NISHIKAWA, ?Cholevid beetles collected on Mt. Shinbo-dake, Niigata prefecture (Distributional records of the Cholevidae 7)?, COln, vol. 102, p. 9. (en japonais), 1993.