These crawling larvae are young Small Hive Beetles. This is what happens when you bring in honey supers from the hives but do not extract within a few days. It's best to extract the day you take supers away from the bees' vigilant protection. Because we brought too many inside to process in a few days, we had this problem in some supers and could not harvest the honey. The supers went back on strong hives. You could freeze them as another solution to Small Hive Beetle larvae. | Betterbee