# Lovebug (Plecia nearctica) > Small black-and-red march fly noted for paired, long-lived mating flights and seasonal swarms that are a nuisance to drivers. Source: https://insectscanner.com/species/lovebug/ (updated 2026-10-10) ## Is it dangerous? **Non-toxic.** Lovebugs do not bite or sting and are not venomous. Crushed adults can leave acidic residues and pigments that may stain car paint, windshields and clothing; rinse vehicle surfaces promptly to avoid paint damage. For skin contact, wash with soap and water. **Pets:** Generally harmless to pets. Crushed insects on fur could stain, and repeated ingestion of large numbers could cause mild stomach upset but this is uncommon. ## Quick facts - Scientific name: Plecia nearctica - Also called: Honeymoon fly, Double-headed bug - Order: Diptera (Flies) - Family: Bibionidae (March flies) - Size: 6-8 mm body length (typical) - Colours: Black, Red-orange, Smoky wing - Habitat: Moist grassy areas, roadside verges, gardens with compost or heavy leaf litter, and nearby soils where larvae develop. - Range: Native to Central America; established and common in the southeastern United States and Gulf Coast states, with range expansions northward and inland in recent decades. - Active: Two annual peaks: spring (often April-May) and late summer (often August-September) in the southeastern United States; adults fly during daylight hours. - Lifespan: Adults live a few days up to about a week; most of the life cycle is spent as larva in soil. - Effect on plants: Decomposer - Pest: no ## Overview Plecia nearctica, commonly called the lovebug, is a small march fly in the family Bibionidae. Adults are most noticeable in large, synchronized swarms during two seasonal peaks; males and females remain joined in copula for hours while flying. Larvae live in soil and feed on decaying plant material, helping break down organic matter. Lovebugs are not dangerous to people or crops, but adult swarms can be a nuisance and stain car paint and radiators when crushed. ## How to identify it Adults are small (roughly a few millimetres long) with a rounded, humpbacked thorax. The body is mostly black with a distinct red to orange thoracic area in many specimens; wings are clear to slightly smoky. Males are slightly smaller and often more slender than females. In mating pairs the two flies appear permanently attached at the rear for long periods. - Small humpbacked black fly with a distinct red-orange thorax in many individuals. - Adults commonly seen in mating pairs glued together end-to-end while flying. - Active in large swarms during two seasonal peaks (spring and late summer) in affected regions. ## Lookalikes - **March fly (other Bibionidae)** (Various Bibionidae): Other march flies are similar in shape but often lack the distinctive red-orange thorax or the species-specific swarm timing; microscopic or genitalia characters are needed for certain ID. - **Fungus gnat** (Various families (e.g. Sciaridae)): Fungus gnats are more delicate, longer-legged and not typically seen in persistent mating pairs or large daytime swarms. ## Life cycle - **Egg:** Females lay eggs in soil or decaying vegetation; eggs hatch in a few days to a couple of weeks depending on conditions. - **Larva (maggot):** Soil-dwelling detritivores that feed on decomposing plant material and compost; this stage lasts weeks to months and is the main growth phase. - **Pupa:** Pupation occurs in the soil; metamorphosis lasts days to weeks before adults emerge. - **Adult (fly):** Short-lived, mating-focused adults that form large swarms and are often seen paired in copula for extended periods. ## Diet and predators - Young eat: Decaying plant material and organic matter in soil (detritivore). - Adults eat: Adults feed on flower nectar and pollen, visiting plants such as goldenrod and sweet clover, while spending much of their short lives mating. - Predators of the young: Soil predators, ground beetles and parasitic insects. - Predators of adults: Birds, spiders, predatory insects and other aerial insectivores. ## Effect on plants and gardens Larvae feed on decaying plant matter and help recycle nutrients; adults do not cause significant feeding damage to living plants. ## Where and when to find it Adults: flying over roadsides, grassy verges, gardens and near lights; often seen in mating pairs. Larvae: in soil rich in decaying leaves, compost and mulch layers. - Best time: Best observed during the two flight peaks in spring (April-May) and late summer (August-September) in the southeastern United States; daytime hours. - Tips: Photograph mating pairs from a distance to avoid smearing insects on lenses; bring a macro lens for close detail and watch roadside vegetation for emerging swarms. ## Fun facts - Lovebugs are famous for mating while flying: pairs stay joined together for hours, even for a day or more, with the larger female leading in flight. - Although a nuisance to drivers, the larvae play a helpful role breaking down dead plant material and improving soil. - Mass emergences can be so dense that insects splatter on car radiators and windshields, which led to local folklore and many practical vehicle-cleaning tips. ## Frequently asked questions ### Do lovebugs bite? No. Lovebugs do not bite or sting. ### Are lovebugs harmful to my car? Crushed lovebugs can leave acidic residues and pigments that may stain paint and clog radiators; rinse cars soon after heavy splattering. ### Why are there so many lovebugs at this time of year? Lovebugs have two annual flight peaks (spring and late summer) when many adults emerge synchronously to mate, producing visible swarms. ### Are lovebugs dangerous to plants or crops? No. Larvae help decompose organic matter and adults do not feed on crops, so they are not an agricultural pest. ### How can I keep them out of my house? They rarely come indoors. Adults are drawn to light-coloured surfaces, heat and vehicle exhaust rather than houses; keep doors closed and screens in place during flight seasons. ### How do I get rid of lovebugs on my property? There is no practical large-scale control for seasonal swarms. Reduce attractants by removing excess decaying vegetation and maintaining tidy compost piles; for cars, hose off insects promptly and use a soft scrub if residue dries. --- More about this species: [iNaturalist](https://www.inaturalist.org/taxa/127635), [Wikipedia](https://en.wikipedia.org/wiki/Lovebug). Identify insects and spiders from a photo with the Insect Scanner iPhone app: https://apps.apple.com/app/id1543946563?pt=126685406&ct=web-markdown&mt=8 Identification from photos is never certain: don't handle insects you can't identify, and get medical advice for bites, stings or allergic reactions.