He took a long time to molt but he was a nice little spider.

Keys out to Haplodrassus in (1) and matches the images here 1 for both habitus and palp. Shows as occuring in my general area at eol.org 2 and matches the palp diagram here 3 pretty nicely.

and I've added a adult photo set.

Don't forget to change the date on the data field if you add photos on different days. The system keeps using the first date automatically.

This photo is a juvenile, I was replying so Mandy would know I posted the adult. The adult photo set actually starts here -

However I did forget to change the date when I updated this photo I see.

It helps to check all photos and even do it twice. Some people add the dates to the title so they can be seen when hovering the mouse over the thumbnails, which is very nice when there are several molts.

I am keeping him, he just snacked on a midge. Still a total novice at photographing in the studio, very challenging.

Never would have considered them the work of a novice, they look great! I know how challenging it can be, though (especially with a gnaphosid — they are so fast and hardly ever hold still, at least not when you need them to.)
Great news that you're raising him. And I saw that you sometimes take microscope images, so I'm sure we'll get him to species once mature. If you happen to remember, can you post a comment here if/when you add more shots? Unfortunately people that're subscribed don't get a notification of new images added, only comments.

Also, the genus came to me last night, I think it might be Haplodrassus. I researched the distribution of the species today and added the info to the genus page. Looks like the options in PA are H. bicornis, H. hiemalis, H. mimus, and H. signifer.

I made a better setup today for the shot I posted, it's working out a lot better. I placed a flat rock in a dish and surrounded it with water. That seems to keep them from bolting, though the other spider I posted today was a swimmer surprisingly.

I've tried putting the spiders on an "island" surrounded by water, too! And, yup, a lot of them (especially the fast ones) will just dive right in eventually and either float around or, if they can hold onto something, will even walk right down to the bottom of the water, ha. They sometimes get a bubble of air around their abdomen, thanks to the hairs. Another method that can help is putting the fast spiders in the refrigerator for 15-20 minutes to slow them down but, even then, they warm up pretty quickly so you get like one minute or less. I always keep a clear plastic cup or vial next to me, so when they start running I can cover them with it and wait till they settle down to remove it.
I love the color/pattern on the rock in the new picture!