scarcely perceptible, and on the twenty–first the spider was dead. Our first spider had been stung to death at once, while this one lived seven days and a half after being stored. On September first, while out in the bean patch, we saw a large Lycosid running madly, first in one direction and then in another. Hovering eagerly and excitedly just above was our marginatus, dashing down at the spider again and again as it came into view for an instant, and then circling wildly around until it appeared once more. Now she pounced upon the frightened spider but missed her aim, now she really grasped it but was shaken off. At last the end came. The wasp descended upon the doomed spider, and there was a violent struggle, both the combatants rolling over and over upon the ground, while all that we could distinguish was the flashing of the red upon the body of the wasp. In an instant it was over, and the wasp rose, leaving the spider limp and motionless upon its back. In our other examples of marginatus the spider taken had been so small that the wasp might easily have held it and thrust her sting into any spot that she pleased, but this Lycosid was a different antagonist. Where the two were so nearly matched, there could have been but slight opportunity for skillful surgery. In point of strength the wasp was at a disadvantage, and she must have come off victor by the quick use of her sting. Under these circumstances she must have struck when and where she could, without selecting any particular spot. That she quite realized the power of her foe was shown by her next action. With the utmost circumspection she settled down upon the spider and made a prolonged and careful examination of the mouth parts. The investigation was satisfactory, and without any further stinging she seized the spider by one leg, and this time really dragged it off. It was a good load for her, and it evidently required all of her strength to pull it along. Not far away was a lump of earth, under which the treasure was stowed; and then began the usual hunting performance, which soon resulted in the discovery of another cavity which had a very small opening.