from a gallery at National Geographic by Martin Oeggerli at the Prüftechnik Uri and School of Applied Sciences, FHNW [presumably Fachhochschule Nordwestschweiz]. Top to bottom:
Owl butterfly egg (Caligo memnon) - At the center is a minute opening, called a micropyle, through which the sperm enters the egg.
Red lacewing butterfly egg (Cethosia biblis) - the lacy pattern marks the micropyle, where sperm enters. A similar design appears on the scaly wings that gave the red lacewing butterfly its name.
Large white butterfly egg (Pieris brassicae)
Zebra longwing butterfly egg (Heliconius charithonia) - The egg contains cyanide and other toxins ingested by adults from the plants they eat.