Oh gosh, that looks horrible... there are so many! I'm not sure if this has been mentioned yet (I haven't read the comments), but I heard that leaving copper (like pennies) at their entry points might deter them. I used it once after finding an entry spot. They didn't return, but I only had a couple in the house to begin with... so I can't promise it will work!
Also, with this amount, I'm not sure how many entry points they have! :o