RecentIy I received from Dr. Clifford O. Berg a series of specimens of a diapriid reared from puparia of Sepedon fuscipennis Loew, a sciomyzid fly, the biology of which he has been investigating at Sodon Lake, Oakland County, Michigan. The species falls in Phaenopria as that genus is currently recognized, and it is apparently ancdescribed. At the suggestion of Dr. Berg, I am naming it in honor of Mr. Gustavus D. Pope, the owner of Sodon Lake which he has made available for research to the Cranbrook Institute of Science for a period of three years. Mr. Pope, who is a trustee of the Cranbrook Institute, has a serious interest in the research sponsored by that organization and has done a great deal to make it possible. It is, therefore, with particular pleasure that I dedicate this new species to him.