I have not seem a polygamous moth; but have read of experiences
with them.

Sometimes the eggs have a smooth surface, again they may be
ridged or like hammered brass or silver. The shells are very
thin and break easily. At one side a place can be detected where
the fertilizing fluid enters. The coming caterpillar begins to
develop at once and emerges in from six to thirty days, with the
exception of a few eggs placed in the fall that produce during the
following spring. The length of the egg period differs with
species and somewhat with the same moths, according to suitable or
unfavourable placing, and climatic conditions. Do not accept the
experience of any one if you have eggs you very much desire to
be productive of the caterpillars of rare moths; after six days
take a peep every day if you would be on the safe side. With many
species the shells are transparent, and for the last few days
before emergence the growth of the little caterpillars can be
watched through them.

When matured they break or eat a hole in their shells and emerge,
seeming much too large for the space they occupied. Family
characteristics show at once. Many of them immediately turn and
eat their shells as if starving; others are more deliberate. Some
grace around for a time as if exercising and then return and eat
their shells; others walk briskly away and do not dine on
shell for the first meal. Usually all of them rest close
twenty-four hours before beginning on leaves. Once they commence
feeding in favourable conditions they eat enormously and grow so
rapidly they soon become too large for their skins to hold them
another instant; so they pause and stop eating for a day or two