This spider fell out of my pant leg after I had left pants on the floor overnight. I'm in NW Illinois and hoping someone can help me identify what kind it is. It's a bit less than 1" including legs; distinct red stripe on back side of abdomen, and slightly less distinct reddish marks on anterior underside of abdomen. First photo looks brownish but it's really quite black looking. Sorry for poor image quality, but I could only photo through the jar it's in. It's pretty quick in how it moves - not jumping, but just fast. I can't find anything like it in the guides, pretty sure it's not a black widow...? I'm a retiring wildlife biologist who normally works with mammals, but I'm curious about All the Things. Thanks for any help!
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