Thank you very much, Tim. Late yesterday afternoon, after it stopped raining, I ran out with my dip net and took a single sample from the very edge of a small sump hole behind our local Arby's. (I avoided, as best I could, the hamburger wrappers and styrofoam cups.) When I dumped the contents of the net into a plastic basin, four or five of these larvae turned up, along with a first-instar green darner larva, a mature damselfly larva, a pupa I couldn't identify, numerous midge larvae, hundreds of very small water fleas, and who knows what else. I stopped examining the contents after ten minutes. I observed the little darner attack [unsuccessfully] one of the water fleas. Thanks again. -- Dave