Definitely wax moths, Karen. They can get into the tray and enjoy the bits of wax and pollen that collect there, and have a nice, dark place to lay eggs & cocoon without getting much hassle from the bees 
Have you had a chance to check the hive inside? A strong colony won’t allow much pest presence, but with so many larvae I’d want to make sure all is well.
Here’s a good post on those gross little bastiges, and instructions for a trap 