"Horror of Greenvale", it says!
Hey, don't blame me, I'm just quoting the Wikipedia article.
The confusing tangle of appendages in the above picture is caused by an aspect not mentioned in the Wikipedia article -- these critters are also opportunistic cannibals.The House centipede, Scutigera coleoptrata, also known as the horror of Greenvale, is a yellowish grey centipede with 15 pairs of legs. Originally endemic to the Mediterranean region, the species has spread to other parts of the world, where it usually lives in human homes. It is an insectivore; it kills and eats insects.
A couple of more pictures may make the situation more clear.
What we're looking at is one large centipede that has captured and is quietly eating a smaller member of its own species.
The larger one is about 30 mm body length and 100 mm total length including extended antennae and rear legs. The smaller one, underneath and upside down, is about half that size.
I had never seen or even known about these beasts until a couple of weeks into this trip, when I found a dead one in a basement in Nebraska. Then I found a live one outside after dark at the same place, but it was way too fast too get a picture of it. (The Wikipedia article says that they can run up to 16 inches per second, a number I find easy to believe.)
The live one shown above, however, seemed far too busy eating to worry about me and my camera equipment. I found it on some carpeted stairs in a basement near Minneapolis, and it sat happily munching away while I shot a good series.
Interesting critters -- hope you enjoy the photos!
PS. Don't take that "horror of Greenvale" stuff seriously. According to Google just now, this one Wikipedia article is the only place on the entire web that uses that phrase for anything at all. It's intended to be amusing, I suppose, but it's not appropriate given the source. I imagine it'll be fixed soon...
Technical: Canon 300D camera, Sigma 105 mm f/2.8 macro lens at f/18, off-camera flash with paper-towel diffuser.