Common House Mosquito

The common house mosquito is one of the most widespread mosquitoes in temperate regions, thriving wherever people leave standing water behind. It is a nondescript, uniformly brown insect without the bold stripes or spots seen on some other mosquito genera, which makes it easy to overlook until its whining flight gives it away at dusk.

This species is closely tied to human settlement, breeding readily in storm drains, gutters, birdbaths, discarded tires, and other artificial containers. Its tolerance for polluted or nutrient-rich water sets it apart from many mosquitoes that require cleaner habitats, allowing it to persist in dense urban environments year-round in warmer climates.

As a member of the genus Culex, it is active mainly from dusk through night, resting during the heat of the day in shaded, sheltered spots such as vegetation, culverts, or the undersides of structures.

• Slender body with uniform light to medium brown coloring and no strong contrasting bands
• Rounded, blunt-tipped abdomen (unlike the pointed abdomen of Aedes mosquitoes)
• Narrow, scaled wings held flat and folded over the back at rest
• Long, thin legs and a slender proboscis used for feeding
• Rests with its body roughly parallel to the surface it lands on
• Distinguished from Anopheles mosquitoes, which tilt their bodies upward at a steep angle when resting

Common house mosquitoes are found throughout temperate and subtropical regions worldwide, wherever standing water and human dwellings coexist. Breeding sites include clogged gutters, storm drains, catch basins, unused swimming pools, buckets, and other water-holding containers, especially those enriched with organic debris.

Adults are most active from late spring through early fall in temperate climates, with peak activity around dusk and into the night. They shelter by day in cool, humid, shaded locations such as tall grass, shrubs, crawl spaces, and culverts.

Females require a blood meal from birds or mammals to develop their eggs and are most active at twilight and after dark, while males feed only on nectar and plant sap for energy. Adults are relatively weak fliers and tend to stay within a few hundred meters of their breeding site over their lifetime.

Larvae are aquatic filter feeders, straining algae, bacteria, and organic particles from the water column, and they play a role in nutrient cycling within small, still water bodies. Both larvae and adults serve as food for a range of predators, including fish, dragonfly nymphs, birds, and bats, making the species an important link in local food webs despite its small size.

Females lay eggs in raft-like clusters that float on the surface of still water, with each raft containing up to a few hundred eggs. Eggs hatch within a day or two into aquatic larvae, commonly called wrigglers, which breathe through a siphon at the water's surface and molt through four larval stages over one to two weeks depending on temperature.

The final larval molt produces a comma-shaped, non-feeding pupa known as a tumbler, which also breathes at the surface but is far more mobile than the larva. After one to a few days, the pupal case splits and the adult mosquito emerges onto the water surface before flying off. Multiple generations occur each warm season, and in temperate climates mated females overwinter in sheltered, unheated structures such as basements, culverts, and storm drains, resuming activity in spring.