Dragonflies
Most species of dragonflies -- as well as their cousins damselflies -- lay eggs in water. Damselflies can be differentiated from dragonflies by the former's tendency to hold their wings parallel to their bodies. Both species of insects frequently lay eggs with a partner. The Water Prince dragonfly lays eggs in water while the male is still attached to her. The Fiery Skimmer, conversely, lays eggs while a male lingers nearby to guard the female and the eggs.
Water Scorpions
Water scorpions are not actually scorpions. Instead, they get their name because their two front limbs are used to grasp things and are shaped like the scorpion's pincers. These insects lay their eggs in water. Unlike most insects, water scorpions do not have a metamorphosis phase in which they change from larvae to fully formed adults. Instead, newly hatched babies look like miniature adults.
Water Beetles
All of the approximately 200 species of water beetles lay their eggs in water. These beetles have a diverse array of adaptations for living in water. Some can breathe through gill-like organs on their exoskeletons. Others surface in order to breathe outside the water. Still others only live in water as larvae and then become terrestrial adults. Water beetles feature hard, rounded bodies and strong hind legs.
Flies
Several species of flies lay their eggs in water, including black flies and mayflies. Horseflies, large biting insects, are frequently found in moist and humid areas and lay their eggs on objects floating in water or very close to water. Some gnats and midges -- tiny, non-biting flies that swarm -- lay aquatic eggs.