In those passages, the bees are a symbol of asexuality, industry, and empire. And as long as we are talking about Virgil and his bees, I might as well mention how Dante uses the same image for his angels:
Even as a swarm of bees, that sinks in flowers
One moment, and the next returns again
To where its labour is to sweetness turned,
Sank into the great flower, that is adorned
With leaves so many, and thence reascended
To where its love abideth evermore.
Their faces had they all of living flame,
And wings of gold, and all the rest so white
No snow unto that limit doth attain.
From bench to bench, into the flower descending,
They carried something of the peace and ardour
Which by the fanning of their flanks they won.
from Paradiso, Canto 31, Longfellow Translation
http://www.everypoet.com/Archive/poe...dante_x_31.htm