Several common insect groups are known for their long, prominent wings, and the one you spotted likely belongs to one of a handful of families: dragonflies, damselflies, lacewings, dobsonflies, mayflies, or katydids. Identifying which one comes down to a few simple features like wing shape, body size, color, and where you found it.
Dragonflies and Damselflies
These are the most recognizable long-winged insects. Both have two pairs of transparent, heavily veined wings that extend well beyond their slender bodies. Dragonflies hold their wings out flat to the sides when resting, while damselflies fold theirs together above the back. You’ll almost always find them near water, since their young develop in ponds, streams, and lakes.
Dragonflies are powerful fliers. Their four wings operate independently, letting them hover, make sharp turns, and even fly backward. They beat their wings about 30 times per second, while the smaller damselflies reach up to 80 beats per second. Dragonflies use asynchronous wing strokes, where the front and back pairs move out of phase for stability, then shift to in-phase flapping when they need a burst of speed for takeoff or chasing prey. Both are completely harmless to people and are voracious predators of mosquitoes and gnats.
Green Lacewings
If the insect you found is pale green with delicate, see-through wings and long antennae, it’s almost certainly a green lacewing. Adults measure about three-quarters of an inch from head to wing tip, with wings that look lacy or net-like under close inspection. You can confirm the identification by checking whether the small veins along the front edge of the wing are forked into a Y shape.
Green lacewings are beneficial insects. Adults feed on nectar and honeydew, while the larvae are aggressive predators that impale aphids and other small pests with sharp, curved mouthparts and drain their body fluids. Lacewings are considered so useful for pest control that some species are commercially bred and sold for release in greenhouses and gardens. Finding one in your home is no cause for concern. It was likely attracted to light and wandered inside.
Dobsonflies
Dobsonflies are hard to miss. Adults can reach three inches in body length with a wingspan up to five inches, making them one of the largest winged insects in North America. They’re drab brown with broad, somewhat floppy wings that aren’t built for agile flight. Males sport dramatic sickle-shaped mandibles that add another inch or more to their length, though those oversized jaws are mostly for show, used in jousting with rivals. Females have shorter, stouter mandibles that can actually break skin if you handle one carelessly.
Despite their intimidating appearance, dobsonflies are harmless visitors. Adults are short-lived, and their aquatic larvae (called hellgrammites) grow up to 3.5 inches long in streams and rivers, breathing through feathery gills. If a dobsonfly turns up on your porch at night, it was drawn to the lights and will move on.
Mayflies
Mayflies have long, transparent wings with a distinctive upright posture. They can’t fold their wings flat against their bodies, so at rest the wings stay raised like tiny sails. Most species have a large front pair and a much smaller hind pair, plus two or three long, thread-like tails trailing from the abdomen.
The name Ephemeroptera, from the Greek for “short-lived wings,” says it all. Adult mayflies don’t eat. Their mouthparts are vestigial. Some species emerge, mate, and die within a single day. You’ll see them swarming near lakes and rivers in spring and summer, often in such large numbers that they coat streetlights and parked cars. They’re completely harmless, just briefly abundant.
Katydids and Long-Winged Crickets
Katydids look like grasshoppers with oversized wings and much longer, thread-like antennae. Their wings often extend past the tip of the abdomen, and in many species the front wings are textured to resemble leaves. Males produce sound using specialized organs on their front wings, creating the rhythmic calls you hear on summer nights from August through September in many regions.
Wing length varies a lot within this group. The prairie meadow katydid, for example, has wings only about one-quarter the length of its abdomen, while other species have wings that extend well beyond the body. Some katydid species come in both long-winged and short-winged forms within the same population, with the long-winged individuals better equipped for dispersal. They live on grasses and low vegetation and are harmless plant feeders.
How to Tell Them Apart
A few quick features narrow things down fast:
- Wing texture: Clear and net-like veining points to lacewings, dragonflies, or mayflies. Opaque, leaf-like wings suggest katydids. Broad, brownish wings on a large insect indicate a dobsonfly.
- Body shape: Long, needle-like abdomen means dragonfly or damselfly. Soft, green body with long antennae means lacewing. Bulky body with prominent mandibles means dobsonfly.
- Wing position at rest: Wings held flat to the sides is classic dragonfly. Wings folded above the back could be a damselfly or mayfly. Wings held tent-like over the body suggest lacewing or katydid.
- Location: Near water suggests dragonflies, damselflies, mayflies, or dobsonflies. In the garden or on a porch light, think lacewing. In tall grass or shrubs, think katydid.
Long-Winged Insects Found Indoors
When a long-winged insect turns up inside your home, the first priority is figuring out whether it’s a one-time visitor or a sign of a problem. Lacewings, dobsonflies, and mayflies are all attracted to lights and wander indoors through open doors and windows. None of them breed indoors or cause damage.
The insects worth paying attention to indoors look quite different. Termite swarmers have two pairs of equal-length wings, a thick waist, and straight antennae. Flying ants (reproductive forms) have a pinched waist, bent antennae, and two pairs of wings where the front pair is noticeably larger. Clothes moths are tiny, buff-colored, with a wingspan under half an inch, and you’ll find them in closets near wool or natural fabrics. Indian meal moths are slightly larger, about five-eighths of an inch, with wings that are reddish-copper on the outer portion, and they cluster near stored food in kitchens and pantries. Drain flies are very small (about 2mm), gray, and fuzzy, appearing near bathroom sinks.
If the insect you found is large, green or brown, clearly veined, and showed up once near a window or light fixture, it’s almost certainly a harmless outdoor species that came inside by accident. Gently catch it in a cup and release it outside, or simply leave a window open nearby.