Scorpionfly

Scorpionflies, mostly in the genus Panorpa, are slender insects named for the male's bulbous, upward-curving genital capsule at the tip of the abdomen, which superficially resembles a scorpion's stinger but is used only in mating and carries no sting or venom of any kind. This resemblance is purely cosmetic and the group is entirely harmless in this regard.

Scorpionflies are easily recognized by their elongated, beak-like head (rostrum) that ends in small chewing mouthparts, an unusual feature among insects that gives the group its distinctive, almost comical face. Their two pairs of narrow, patterned wings and generally slow, fluttery flight also help set them apart from true flies and wasps.

Both adults and larvae are mainly scavengers, feeding on dead insects and decaying organic matter, and adult males are also known for presenting food gifts to females as part of courtship, a behavior that has made scorpionflies a well-studied group in the science of insect mating systems.

• Elongated, downward-pointing beak-like head (rostrum) with chewing mouthparts at the tip
• Two pairs of long, narrow, membranous wings, often with dark banding or spotting, held outstretched at rest
• Males have a swollen, upturned genital capsule at the abdomen tip resembling a scorpion's tail, used only for mating and lacking any sting
• Slender body, typically brown, black, or reddish, with long legs
• Slow, weak, fluttering flight
• Lookalikes: crane flies (no beak-like head) and some wasps (scorpionflies lack a narrow waist and true stinger)

Scorpionflies are found through temperate regions of the Northern Hemisphere, favoring moist, shaded woodlands, hedgerows, and dense undergrowth near leaf litter. They are most active in warmer months, typically resting on foliage in shady, humid spots and becoming more noticeable when disturbed from vegetation.

Adult scorpionflies are primarily scavengers, feeding on dead or dying insects, and will also feed on nectar, fruit, or other organic matter when available. Males often present a captured insect or a glob of saliva as a nuptial gift to females before mating, a behavior tied closely to courtship success. Larvae live in soil or leaf litter and similarly feed on dead insects and decaying organic material, making scorpionflies useful contributors to the breakdown and recycling of organic matter within woodland ecosystems.

Females lay eggs in small clusters in moist soil or leaf litter. Larvae are caterpillar-like with short legs and live in the soil or litter layer, feeding on dead insects and organic debris through several instars over a period of weeks to months. Mature larvae pupate in the soil, and adults emerge in spring or summer to feed, court, and mate, typically completing one generation per year in temperate climates, with the species overwintering as pupae or late-stage larvae.