So some of the beetles have gone rogue and are interfering with our efforts to locate the lair of the wasps (even if unintentionally). Naturally, this treason can not be allowed to stand... but we have to treat the matter with some degree of care, since coming down on the wrong beetles will cause more harm in the long run. 

I have an idea. 

Step 1: We need to develop a pheromone that, when ingested, blends in with the natural scent of the eater, but can be picked up by our more sensory advanced scouts like the great light in the sky on a blue day. 

Step 2: We use said pheromone lace a stockpile of berries. We can then offer it up to the beetles freely without uneven distribution for good or bad behavior. We can claim it is a celebration of unity and the bounty that we all now have access to since the end of the conflict between us. Try and cement some good will and maybe bring some beetles on the fence over to our side. 

Step 3: With the laced berries being consumed, all we have to do is keep an eye out for a trail of the pheromone that is heading off into the general area the other rebel beetles have fled into. As long as we avoid giving the beetles any tasks or jobs that leads them in that general direction, any pheromone trail heading that way will stand out easily. Even better, it's likely that any group making the trip will take along supplies to help tide themselves over for the journey, as well as to help out whatever hive they are setting up.