I have always used the way my mother used to catch the nasty black slugs and large snails that visited our garden in England. Grapefruit skins. Orange skins work well too.
We are now into our 4th, 18 lb bag of Texas, ruby red grapefruit. We grow the best grapefruit here in Texas. We each have a half a grapefruit every morning for breakfast and the empty peel goes out into the garden. Every day I check underneath and dispose of the haul. There is always a collective noun to describe large groupings of a particular creature. Move aside crows, you have some company. This is crying out to be called a murder of pill bugs.