G. F.  Knowlton and Thomas, W. L., ?Some Cache Valley Utah insects?, Proceedings of the Utah Academy of Sciences, Arts and Letters, vol. 11, pp. 245-246, 1934.

G. F.  Knowlton and Harmston, F., ?Utah Diptera?, Proceedings of the Utah Academy of Sciences, Arts and Letters, vol. 14, p. (147), 1937.