For several years I have observed with much interest the oviposition of our large and handsome “long-stings,” but not until this summer have I been able to witness their actions preparatory to this duty. Although the males are frequently numerous when the femals are ovipositing, the sexes pay no attention to one another, and this fact led me frequently to wonder at what time mating occurs. Last year I had, in compnay with Mr. Fletche, observed the males in strange positions, with the tip of the abdoment applied to the bark, or inserted in a crevice, and had suggested that they were awaiting the emergence of the female. The supposition was, however, not proven, and the actions observed wer still a matter of conjecture and for further observation.