Trypoxylon (Trypoxylon) clavicerum Lepeletier and Serville is a widespread Palearctic wasp, occurring from Northern Europe to Japan (Bohart and Menke, 1976, Sphecid wasps of the world, University of California Press, 695 pp.). In the course of a systematic study of Trypoxylon wasps in North America, I discovered that T. clavicerum now occurs in the Great Lakes Region of the United States and Canada. North American specimens were compared with examples of clavicerum in the collections of the British Museum of Natural History (London), Oxford University, and the Zoologisk Museum (Copenhagen). No differences between the North American and European specimens were found.
Coville, Rollin E., "The Occurrence of Trypoxylon clavicerum in North America (Hymenoptera: Sphecidae)" (1984). Co. Paper 148.
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