I JUST read an article yesterday about the brown widow and they are not very toxic at all, even the black widows rarely cause more than mild flu like symptoms from their bites. The article was in a travel mag I get and they said that both the brown and black widow spiders have been downgraded over the years as far as the hype they have taken. I don’t know for certain, but, I doubt there can be a black/brown widow and brown recluse hybrid. I think their habits and habitats are not a blend, and even if they overlap ranges they are two completely different species. That’s a research job I guess.