In one hive I found yellow larvae still in the crescent shaped stage. I think they were 3rd to 4th stage instar. (forgot to write it down) That hive also has some cells with larvae and brood, but I noticed some cells have multiple eggs and others have one. Some eggs are hatching into worker cells and the eggs appear to be on the bottom of the cells, not the walls. I'm wondering if it is possibly a young queen and if it is safe to treat with OA in case of varroa. I thought I saw frass in two cells. Temps here are hitting the 90s. Another hive looks to have fully formed brood with the caps partially chewed off and then they died. I didn't see active chewing or movement. Populations in both hives is strong. suggestions?