 Spider Wasp:
This solitary wasp isn't as aggressive as the communal yellowjackets or bees, but you probably don't want it inside. As the name implies, it parasitizes spiders. Use a rag or jar and toss it outside. If more come inside your home, find the source of entry and seal that area.
Photo: Peter J. DeVries
http://spiders.entomology.wisc.edu/pred_para/pompilidae/
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