A day or two after we had seen frigidus making her residential arrangements, we found twenty–five or thirty within a few feet of each other, working with great ardor at carrying in queens, the doors being left closed or open according to individual judgment. The steadiest workers brought one every forty minutes, scarcely pausing inside the nest, but others made long stays within, leaving the door closed. The ants were carried under the body with all the legs folded around them, but they were heavy things, and were often dropped as the wasp flew across the field, giving opportunities for robbery that were promptly taken advantage of. We picked up one of these ants and placed it in the doorway of a wasp that had just gone in. She came up twice, looked at it, and backed down again; but the third time she first touched it, then seized it and took it below. From another wasp that was just entering we took the ant she had dropped and moved it half an inch away. When she had turned and come up for it, she seemed surprised, came out and looked about, found it and dropped it in the doorway, going in herself to turn around as before. We seized this chance to move it again, and again she came out, found it, took it back, and dropped it. This was repeated five times, but when she took it in for the sixth time, after dropping it, she whirled around and picked it up so quickly that our malice was foiled. [Illustration: APHILANTHOPS GATHERING ANTS] We were puzzled by the actions of a wasp that approached her nest again and again, but always circled away without entering, until looking closely we saw that she was pursued by two tiny flies. When she alighted and walked about awhile with her ant tucked under the third leg on one side, the flies alighted also and walked about behind her. In the end she evaded them by a sudden drop into her hole.