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Friends were swimming in Bull Creek when they noticed a snake skin hanging from a deeply undercut high bank. When they swam over to retrieve it they discovered that the snake was still in it. A wolf spider had a firm grip on it and was munching away. It was able somehow to hold the weight of the snake in spite of clinging on an overhanging lip. This is not a spider you would want to run into in a dark alley, let alone your bathroom where we find them occasionally. They were able to film this cellphone video.
The victim is a midland brown snake, aka Dekay's snake (Storeria dekayi). They are 9-13 inches long and live mainly in moist soil where they consume mainly slugs and earthworms. They have long teeth that let them cling to a snail until it finally gives up and is pulled out of the shell. Their scales have keels, a raised line down the center like the keel of a boat as seen in the picture above.
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I was unable to find any reference to a wolf spider eating a snake. I will leave the final interpretation to you although the video is very convincing.
Thanks to Garin Ferguson for finding it and to "Snakebite Jon" for swimming over an 8 foot deep stretch of water with an Iphone to get the pictures and video.