S. W.  Williston, ?On the diptera of St. Vincent (West Indies)?, Transactions of the Entomological Society of London, vol. 1896, pp. 253-446,pl.14?, 1896.

S. W.  Williston, ?Diptera Brasiliana, Part IV?, Kansas University Quaterly, vol. 6, pp. 1-12, 1897.