G. C.  Steyskal, ?The dipterous fauna of tree trunks?, Papers of the Michigan Academy of Science, Arts and Letters, vol. 35, pp. 121-134, 1949.

L. W.  Grensted, ?Some records of Diptera in Anglesey, Derbyshire and Cheshire?, Entomologist's Monthly Magazine, vol. 85, p. 99, 1949.

J. E.  Collin, ?Results of the Armstrong College Expedition to Siwa Oasis (Libyan Desert), 1935, under the leadership of Prof. J. Omer-Cooper. Diptera Empididae, Dolichopodidae, Aschiza and Acalypterae?, Bulletin de la Société Fouad 1er d'entomologie, vol. 33, pp. 175-225, 13 figs., 1949.