Flies belonging to the genus Pseudochaeta are widely distributed in the United States and southern Canada but the allied genus Phaenopsis has not been recorded hitherto from North America. A recent study of the accumulated material in these genera has brought to light a number of distinct species, which are described below. I am especially indebted to C. F. W. Muesebeck, Dr. R. H. Beamer and A. R. Brooks for the loan of material. Types of the new species are in my collection.