I've seen the back swimmers & boatmen but I believe these are different. First of all I have an AG pool, 12x24 with a power ionizer. We shock it once a week and use a clarifer. One of the swimmers yesterday said a small bug bite them and it felt like a bee sting - I went out and couldn't find anything - usually with the backswimmers I can spot them fairly easy. We shocked the pool last night and again this AM I went out and didn't see anything - then a few hours later I went and I saw the small (right around 1/8 inch long) black bug- it appeared to have have the beetle-body shape and 6 legs - it was skimming perfectly along the top of the water - this is our first experience with this letter bugger and I would appreciate some insight.