I keep a pet widow named Minka. I usually just feed her any other spiders or insects I find inside the house. This other spider, Alex, was found in my basement.
I put Alex in Minka's jar late one night and when I woke up, they were both still around and seemed to be respecting the space of the other. After watching Alex for a while, I noticed he seemed especially shy. If he sensed movement, a change of light or there was a noise he would curl up and play dead. It would take about 3 minutes for him to become comfortable moving around again. When he unfurled his legs he seemed much bigger than when he was playing dead.
I shot some video of him and Minka and then let him go out near our wood pile. We live in Oregon near Portland.
Thank you for the suggestion. But the spider in question didn't look like that.
I'm sorry the photos aren't better. I didn't plan to post them when I shot them.
The Antrodiaetus pacificus has defined markings on his abdomen while the one I found did not.
The Antrodiaetus pacificus also has a prominent disk like cephalothorax that is slightly larger than the abdomen. The one I found had a cephalothorax that was much smaller than the abdomen and was more globular than disk like.
The Antrodiaetus pacificus also has a surface that appears to be hard on most of its parts. The one I found seemed to have a soft and fuzzy quality on its abdomen and cephalothorax but did have have the look of a hard surface on its legs.
The thing that is the most similar between the Antrodiaetus pacificus and the spider I found was the hairy legs.
I tried to get photos of him opened up, but as soon as he unfurled his legs he would run very quickly all over the place.