I'm just curious if there are any really noticeable, visual differences between Latrodectus hesperus and mactans or if it's more just a matter of the region they're from. I'm having a bit of trouble IDing 2 widows I have. Although I'm pretty sure they're both Hesperus as they were both caught in Utah, I'm still curious to know if there are ways to tell them apart other than location. One is more brown than the other and is more robust. The other is jet black and a on the thinner side, but still plump.