While sweeping for Hymenoptera in early June, 1961, in the Gatineau Park region of Quebec, about 15 miles northwest of Ottawa, Ontario, one of the authors took a specimen of the rare and interesting genus Streblocera Westwood. Discovery of this specimen, in a relatively recently glaciated region remote from all localities previously reported for the genus, prompted a search for further material, which however was without avail. Finding the species to be undescribed and also easily recognizable by a number of distinct structural features, the writers venture to present the following description based on the single example at hand.