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D. E.  Hardy and Knowlton, G. F., ?New and little known Western Pipunculidae (Diptera)?, Annals of the Entomological Society of America, vol. 32, pp. 113-124, 1939.

D. E.  Hardy and Knowlton, G. F., ?New and little known Utah Pipunculidae (Diptera)?, The Canadian Entomologist, vol. 71, pp. 87-91, 1939.