The fauna of Utah is unusually rich in Diptera. Much remains to be done by way of recording the forms that occur in this area and in learning the distribution of the economic forms within the state. The following records are from recently classified material of the Utah Agricultural Experiment Station collection. The writer is indebted to Messrs. J.M. Aldrich, C.H. Curran, C.T. Greene, R.H. Painter, and J.S. Hined for naming most of the material listed below.