The picture is not that clear, but it looks more like a wolf spider than a brown recluse. Wolf spiders are not harmful. Here is a little information about common Missouri spiders: http://extension.missouri.edu/p/G7386
This is another one on a different trap. The body of the first one I sent was gray unlike this one. The first had what looked like an eye design. So you are saying that these are Wolf?
Unfortunately the next two pictures are equally hard to see. You can see the difference between wolf and brown recluse spiders here: