Not sure about this family placement, but here's the story. I found her on my car and put her in a vial. An hour later she had built a little sac nest in the inside curvature of the vial, but I induced her out of it onto a leaf. A fast runner initially, she slowed down once on the leaf, then stopped for a short while. So I took the first picture (among others) while she was on the upper leaf surface. Then she went to the underside and immediately began to span the curvature of the leaf with silk threads. (Reminded me of Cheiracanthium behavior.)