Hi Tom, thanks for solving the mystery! That makes sense, as the white lining had a consistency similar to spider web, and now, googling ‘tarantula spider hole’ I see some photos that look similar (though only a few of them show the white lining as prominently). I like spiders, but have only had the good fortune to come across a tarantula once in my hikes around here… I’m not sure I would recognize a wolf spider (tarantulas are a bit more distinctive with all the fur!). If I find another hole like this, I might succumb to the temptation now to empty my water bottle in it!
Thanks again, Ben