Here's a clearer photo I took last year. Note the dark mating pads on the hind foot, which help the male better clasp his slippery sweetheart.
Here's another, paler, color of spider, just a wee bit bigger, but also able to scoot about on the water. Can you see the little dimples under its feet where they press on the surface? Note, too, all the tiny white dots all over the water. They were some kind of flea-like creature, hopping constantly, almost too small to see, but making the sunlight glitter in little specks on the surface.
Hundreds of dark, oval bugs were darting around like crazy under the water. Except for this pair, who crawled out onto a log to engage in more romantic business. Ben Snyder, an environmental educator at Moreau Lake State Park, believes that these are Predaceous Diving Beetles, a species that manages to stay under water for long periods by storing air under their wing covers. Scuba bugs. And by the way, as their name suggests, they do bite.