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A new species of midge is described and named Oligotrophus apicis (Diptera: Cecido-myiidae). The life history of O. apicis is given with an illustrsted key to the species of Oligotrophus recognized in the United States with information on their distribution. In August, 1952, Dr. Ralph B. Neiswander observed injury to Canaert Redcedar, Juniperus virginiana 'Canaertii', in Lake County, Ohio, caused by midge larvae. This insect was identified by Dr. Richard H. Foote of the United States National Museum as Oligotrophus sp. This paper describes a new species of Oligotrophus, presents additional information on its life history, and includes a key to species of the genus known to occur in the United States. Prasad and Grover (1963) have reviewed the nomenclature as applied to the male genitalia of the Cecidomyiidae. A summary based primarily on their wor