The Monarchs' egg is very small and looks very much like the dots that is located on the milkweed leaf. They are also surrounded by a hard outer shell, called chorion and they are in well shape. The chorion is for protection during the developing of the larva stage. The shell is covered with a layer of wax, which helps keep the egg from drying out. (see image)
Eggs also have Micropyles holes that is a tiny funnel like opening at
the end of the egg. This hole forms before the hard shell of the
egg is formed and it is penetrated all the way through the shell.
Micropyles exits so that sperm can enter the egg.
Ridges are also the raised areas on the egg shell. They are formed
inside the female before she lays the egg.