Nothing outside the bean family is of any use to the Bruchus.
Thus limited, its portion is none the less considerable, and it uses and abuses it with the utmost energy.

The eggs are white, slender, and cylindrical.

There is no method in their distribution, no choice in their deposition.

The mother lays them singly or in little groups, on the walls of the jar as well as on the haricots.

In her negligence she will even lay them on maize, coffee, castor-oil seeds, and other seeds, on which the newly born grubs will promptly perish, not finding them to their taste.