I'm not familiar with the spiders of the southwest...but it could have been a wolf spider or something. I am sure you are familar with the tarantula. Not sure what you had there but it was WAY, WAY, WAY too damn big to be sharing living space with you! I hate spiders with a passion. I was never afraid of snakes (although I treat them with respect) and live in an area filled with rattlers and copperheads, but spiders scare the crap outta me! About the most common ones I see here are the common house spider, the jumping spiders, funnel web builders and a beautiful but scary looking black and bright yellow one that often builds a web in big weeds. There are of course the ones that build those pesky webs in the woods each Fall around the time hunting season starts! I hate walking through those damn webs! LOL. And unfortunately, there is no shortage of brown recluse or black widow spiders either. I have learned to treat any shiny, black spider with caution though...as it seems there are some variations within the black widows red hourglass marking on the belly. I have seen some with stripes in place of the hourglass and others with more of a round dot, and yet others with hardly no red marking at all. But they were all dem black widers and I hates um! LOL.
It was funny you mentioned the 12 gauge. There used to be an old man who lived not far from me who wasn't well, all there. He was a great guy and all, but his elevator was stuck in the basement! This guy would literally take an old single shot shotgun and shoot bugs and spiders from his walls! Then again, this guy also had a Maxwell House coffee can that he used for a mailbox, so go figure! I bet his insulation and walls were not in all that great condition. We had so much fun with all the stories he was responsible for.