I live in Northern Indiana and I’ve seen 3 of these spiders in my house before, all different ones. When I first saw it, it scared me since it’s a pretty big spider in my opinion from what I usually have seen around here. This spider was bigger than a quarter all together. I know it’s not the best picture, but this is it on the wall a while ago. Also was a very fast spider so I couldn’t capture it too well. Are they harmless? I woke up with a bite today and then I remembered this!
The spider on your ceiling looks like a sac spider, more a Cheiracanthiid (like a yellow sac spider) than a clubionid (a leafcurling sac spider).
But the colour contrast of the dark red thorax to yellow abdomen suggests it may be broad-faced sac spider, which a is actually classified closer to a wolf spider than to the above two sac spiders. It is considered non-aggressive and non-harmful to humans.
It is hard to tell from the photo whether the cephalothorax is actually red or just dark. So you are probably the best judge from here. Compare what you saw to:
- trachelas tranquillus (broad-faced sac spiders) https://bugguide.net/node/view/26291/bgimage?from=72
- cheiracanthium (yellow sac spider) https://bugguide.net/node/view/3383/bgimage?from=0
I'm also from Northern Indiana. There's only two spider species in the area that are venomous: the Brown Recluse and the Black Widow. It's hard to tell from the picture, but I'm fairly certain that its not a Recluse, and it's definitely not a Black Widow. My best guess would be a Barn Tunnel Weaver.
For future reference: https://spiderid.com/locations/united-states/indiana/ has a list species, with pictures.
https://www.in.gov/dnr/entomolo/4542.htm for more info on Brown Recluses and Black Widows.