Viewing post #714702 by JRsbugs

I've come to the conclusion it's 'probably' a Brown Widow, Latrodectus geometricus. I checked one of your photos in the plant database and found you are in Utah, which is in it's distribution or at least adjacent to.

http://www.spiders.us/species/...

https://www.google.co.uk/maps/...

The Brown Widow Spider does have an hourglass but it is typically an orange shade rather than the vivid red of a black widow

http://cisr.ucr.edu/brown_wido...