What bit me in District of Columbia?

14 biting or stinging species have verified records in District of Columbia. The fastest way to narrow it down is where on your body the marks are and how they are arranged — below the knee in clusters points to fleas or chiggers, lines on uncovered skin point to bed bugs, scattered single bumps point to mosquitoes. Bite season here runs roughly April to October.

Active around now in District of Columbia

• Honey bee
• Bald-faced hornet
• Carpenter ant
• Paper wasp
• Yellowjacket
• Lone star tick
• Deer tick
• Flea
• Horsefly
• Yellow sac spider

Recorded biting species in District of Columbia

Record counts come from the GBIF biodiversity database and reflect how often a species is reported and identified in District of Columbia. They are a guide to what is plausible here, not a census — and they say nothing about how likely you are to be bitten indoors.

Bite season month by month

Of the 14 species recorded in District of Columbia, 14 are active in June — the peak of the local season. The humid subtropical climate here is what sets those boundaries: species that need warmth disappear at the edges of the year, while the indoor ones do not care.

Narrowing it down in three questions

1. Where on your body? Below the knee in clusters points to fleas or chiggers. Uncovered skin — arms, shoulders, neck — points to bed bugs or mosquitoes. Along a sock line or waistband is close to diagnostic for chiggers.
2. How are they arranged? A line or zigzag of three or more suggests bed bugs. Scattered single bumps suggest mosquitoes. A curved group with white pustules the next day means fire ants.
3. Indoors or outdoors, and when? Bites that appear overnight in one specific bed are a different problem from bites after an afternoon in tall grass. In District of Columbia the outdoor season runs April to October; the indoor species run all year.

Stings rather than bites in District of Columbia

Honey bee, Bald-faced hornet, Carpenter ant, Paper wasp, Yellowjacket are recorded here. Stings differ from bites in one way that matters: they can cause anaphylaxis in sensitised people, and that risk does not depend on how bad previous stings looked. Anyone who has had a severe reaction should carry an adrenaline auto-injector.

Species associated with illness here

• Lone star tick bite — ehrlichiosis, Heartland virus, tularemia, STARI, alpha-gal syndrome (red meat allergy)
• Deer tick bite — Lyme disease, anaplasmosis, babesiosis, Powassan virus (rare)
• Flea bite — murine typhus (Gulf Coast, California, Hawaii), cat scratch disease bacteria carried between cats, flea tapeworm (mainly in children who swallow a flea)
• American dog tick bite — Rocky Mountain spotted fever, tularemia, tick paralysis (rare, resolves on removal)
• Kissing bug bite — Chagas disease (Trypanosoma cruzi) — rare in the United States but the reason this bite is taken seriously

Most bites from these species transmit nothing. What matters is the follow-up: note the date of the bite, and report any fever or expanding rash in the following weeks to a clinician, mentioning the bite explicitly.

Year-round in District of Columbia

Weather does not affect everything. Bed bugs, scabies and head lice depend on people rather than season, so a bite pattern in January in District of Columbia points to those first — see what is biting me at night.