Northern house mosquito identification (Culex pipiens)


Insect identifier · Mosquitoes

How to identify a Northern house mosquito

Culex pipiens
· Also called culex, house mosquito, culex pipiens, night mosquito in house, west nile mosquito

Northern house mosquito identification photo

Night bites indoors in northern cities are often Culex pipiens, the northern house mosquito — a plain brown mosquito, not a tiger mosquito.

Someone searching this page usually has a northern house mosquito in a photo, on skin, or in a story about storm drains, birdbaths, indoors. Use the marks, the bite, and the range together. Night bites indoors in northern cities are often Culex pipiens, the northern house mosquito — a plain brown mosquito, not a tiger mosquito.

What does a northern house mosquito look like?

Plain brown, no flashy stripes, rounded abdomen. It breeds in stagnant, sometimes dirty water: storm drains, neglected birdbaths, clogged gutters. It may overwinter in basements.

Northern house mosquito (Culex pipiens) is Small–medium, about 4–10 mm. Colors people notice: brown, tan. Field marks: Plain brown, no flashy stripes; Rounded abdomen; Night biter, often indoors; Breeds in stagnant, sometimes dirty water. It is found both. If those marks are missing, open Western encephalitis mosquito, Inland floodwater mosquito before you force this name. Search phrases that belong on this page include what a northern house mosquito looks like and northern house mosquito identification.

Identification marks

  • Plain brown, no flashy stripes
  • Rounded abdomen
  • Night biter, often indoors
  • Breeds in stagnant, sometimes dirty water

Size: Small–medium, about 4–10 mm
Colors: brown, tan
Where: both

What a typical northern house mosquito bite looks like

Typical northern house mosquito bite or sting
A typical pattern. Reactions vary. This is a guide photo, not a diagnosis.

A few itchy bumps noticed overnight on arms or face after sleeping near an open window. Culex species are the main West Nile vectors in North America; most bites do not transmit disease, but summer fever still needs a clinician.

People searching “northern house mosquito bite identification” want the pattern, not a single anonymous bump. Itchy bump that may appear overnight. Often a few bites on arms or face after sleeping near an open window. Immediate steps on this page: Soothe the itch; check window screens; If you have fever or neurologic symptoms in summer, seek care (West Nile risk is low but real); Empty birdbaths and clogged gutters. This species does bite or sting people. Fever, spreading redness, trouble breathing, or a child with many stings is professional care.

If you were bitten

  1. Soothe the itch; check window screens
  2. If you have fever or neurologic symptoms in summer, seek care (West Nile risk is low but real)
  3. Empty birdbaths and clogged gutters

Northern house mosquito vs Western encephalitis mosquito

No stripes. Night. Indoors. That triad separates Culex pipiens from tiger mosquitoes. Anopheles rest tail-up. If you are bitten in bed in a northern city in July, think house mosquito or bed bug — the mosquito is a few scattered welts, not a breakfast-lunch-dinner line.

Range and season

Common across the northern U.S. and southern Canada. Summer nights.

Northern cities and suburbs, basements, storm drains, and rooms with open windows after dark.

Common across the northern U.S. and southern Canada. A Culex relative (C. quinquefasciatus) replaces it in the deep South.

Summer nights; may overwinter in basements

Common questions

Does the northern house mosquito carry West Nile virus?

Culex species are the main West Nile vectors in North America. Most bites do not transmit disease, but prevention still matters.

Why do I get bitten at night in the house?

Culex often rest indoors and bite after dark. Check screens, door gaps, and basement windows.

What does it look like?

A plain brown mosquito without tiger stripes. Identification to species usually needs a close look at the abdomen and legs.

What mosquito bites at night in the house?

Culex house mosquitoes. They are plain brown, rest indoors, and bite after dark near open windows.

What mosquito bites at night indoors?

Culex house mosquitoes. They rest indoors and bite after dark.

Does the northern house mosquito carry West Nile?

Culex species are the main West Nile vectors in North America. Most bites do not transmit virus.

Related identification pages