I shall see them exploring pods and flowers, and before very long they will lay their eggs.

That is how the pea-weevil would behave under similar conditions.
But no: to my surprise and confusion, matters do not fall out as I foresaw.

For a few minutes the insects bustle about in the sunlight, opening and closing their wing-covers to ease the mechanism of flight; then one by one they fly away, mounting in the luminous air; they grow smaller and smaller to the sight, and are quickly lost to view.

My persevering attentions have not met with the slightest success; not one of the weevils has settled on my haricots.
When the joys of liberty have been tasted will they return--to-night, to-morrow, or later?
No, they do not return.

All that week, at favourable hours, I inspect the rows of beans pod by pod, flower by flower; but never a Bruchus do I see, nor even an egg.