Yes, it is bee-glue (propolis); it is very common on old hives.
They are then killed and covered with a coating of propolis.
They use the propolis for another purpose still, which deserves to be mentioned.
They encase it in propolis, which preserves it from putrefaction.
propolis: a glue or resin-like product elaborated by bees to serve as a cement in cases where wax is not sufficiently tenacious.
And Fessa took the last of the propolis from her very roughly.
According to Huber, who made this observation, the propolis is applied also to the insides of the cells.
We actually saw two or three arrive, and carry the propolis from off the limbs of each with their teeth.
The bees find it difficult to gather the propolis, and equally so to remove from their thighs, and to work so sticky a material.
Annoyed by this inquisitiveness, the bees resolved to put an end to it, and cemented the shutter with propolis.