This is a close-up of one of the freshly laid eggs.
The eggs became dark when they were ready to hatch. Compare the darker color of the egg below with the "fresher" one above.
Hatching takes place just 4-8 days after the eggs have been laid on the host plant. This catepillar had recently emerged and was caught eating the remnants of its egg case. Look closely and you can see the wispy bits of egg case sticking to the leaf and catepillar.
These first instars are black and oh so tiny - maybe a milimeter or two long. But they'll grow quickly, I'm sure!