E. A.  Smith, ?Note on the Genera Geothauma and Gyrostropha?, The annals and magazine of natural history, including zoology, botany and geology, vol. 6, pp. 284-285, 1893.

E. A.  Smith, ?A list of the Bornean species of the genus Opisthostoma and descriptions of four new species?, The annals and magazine of natural history, including zoology, botany and geology, vol. 6, pp. 269-273, 1894.