6 Types of Beetles in Louisiana: From Dung Beetles to Bark Borers
September 23, 2026
Louisiana’s warm, humid climate and mix of wetlands, pine forests, and farmland make the state a haven for beetles of every size and habit. The InsectIdentification.org database lists 215 beetle species documented in Louisiana, ranging from tiny wood-boring weevils to scarabs the size of a golf ball.
Understanding the different types of beetles found across the state helps homeowners, gardeners, and curious naturalists tell a harmless visitor from a genuine nuisance. This guide walks through six of the most common types of beetles in Louisiana, covering what they look like, where they live, and why each one matters to the local ecosystem.
1. Dung Beetle
Dung beetles are among the most beneficial insects a Louisiana yard or pasture can host. According to the state’s beetle inventory, dung beetles in the genus Dichotomius are documented residents of Louisiana, where they thrive in the state’s cattle country and wooded lowlands.
These stocky, rounded beetles have shiny black or dark brown bodies and short, sturdy legs built for digging and rolling. Adults locate fresh manure using scent, then either bury it underground, roll it away in a ball, or tunnel directly beneath the pile to lay eggs. That burial process aerates soil, recycles nutrients, and cuts down on fly breeding grounds, which is why agricultural extension programs often list dung beetles as a free pest-control service for pastures.
Louisiana’s dung beetle activity peaks during the warm months when livestock grazing and rainfall create ideal breeding conditions. Readers researching other soil-dwelling insects that share pasture habitat with dung beetles may find the types of ants in Louisiana a useful comparison, since both groups play similar roles in breaking down organic material.
Pro Tip: If you spot a dung beetle rolling a ball across a lawn or trail, resist the urge to disturb it. That ball is often an egg chamber, and moving it can kill the developing larva inside.
2. Flower Longhorn Beetle
Flower longhorn beetles bring color and motion to Louisiana gardens during the warmer months. The state’s beetle records include several species in the genus Typocerus, along with related longhorns classified under Strangalia, all grouped under the broader “flower longhorn” common name.
True to their name, these beetles have noticeably long, thread-like antennae that can rival or exceed the length of their own bodies. A quick way to separate them from scarab look-alikes: longhorn beetles have antennae as long as or longer than the body, a feature that sets the whole longhorn family apart from stockier scarabs like rhinoceros beetles.
Adult flower longhorns spend their days visiting blooms, particularly members of the daisy and carrot families, where they feed on pollen and nectar while inadvertently helping with pollination. Their larvae, by contrast, live inside dead or decaying wood, chewing tunnels as they mature over one to two years. Gardeners in neighboring states dealing with similar wood-boring visitors can compare notes using the types of insects in Texas guide, since longhorn beetles range across much of the Gulf South.
3. Rhinoceros Beetle
Rhinoceros beetles are the heavyweight champions of Louisiana’s beetle world. The largest beetle species in Louisiana belong to the rhinoceros beetle subfamily, measuring up to 63 millimeters, making them some of the biggest insects a resident is likely to encounter in a backyard or wooded lot.
The group belongs to the scarab subfamily Dynastinae, and Louisiana’s most familiar representative is the American rhinoceros beetle, Xyloryctes jamaicensis. Males carry a single upright horn used for jousting with rivals over mates and feeding sites, while females typically have only a small bump in its place, a pattern Britannica describes as typical of the American rhinoceros beetle.
Despite their intimidating size, rhinoceros beetles are harmless to people and pets. They cannot bite or sting in any meaningful way, and adults mostly feed on tree sap, rotting fruit, or plant matter. Their strength is legendary among entomologists: rhino beetles can lift objects roughly 850 times their own body weight, a ratio unmatched by almost any other animal relative to size. Because their grub stage develops in rotting logs and compost, some enthusiasts even raise them as low-maintenance display insects; readers curious about that hobby can browse the types of insects kept as pets for more context.
| Beetle Type | Typical Size | Diet (Adult) | Common Habitat |
|---|---|---|---|
| Dung Beetle | Small to medium | Animal manure | Pastures, wooded lowlands |
| Flower Longhorn Beetle | Small to medium | Pollen, nectar | Gardens, meadows |
| Rhinoceros Beetle | Up to 63 mm | Sap, rotting fruit | Wooded areas, rotting logs |
| Asian Lady Beetle | Small | Aphids, other pests | Trees, homes in winter |
| June Bug / May Beetle | 12–25 mm | Foliage, flowers | Lawns, woodland edges |
| Bark and Ambrosia Beetles | Under 5 mm | Fungus (farmed in tunnels) | Tree bark, dead wood |
4. Asian Lady Beetle
Asian lady beetles are a familiar autumn and winter sight across Louisiana, especially when they gather on sunny walls looking for a way indoors. Another beetle species found in Louisiana since the 1990s is the Asian lady beetle, which is primarily active during winter months, and its populations have grown steadily since first establishing in the state.
This species can be distinguished from native ladybugs by its more variable coloring, which ranges from pale orange to deep red, and by a small black “M” or “W” marking behind the head. Numbers on a single beetle’s back can vary from none to nineteen, unlike the more predictable spot counts of native lady beetle species.
Homeowners sometimes worry when Asian lady beetles cluster by the hundreds near windows and attics, but these species are not harmful and do not cause significant damage even when their numbers climb inside a home. They can, however, release a mild odor and yellowish fluid if crushed, which is a defense mechanism rather than a sign of danger. For readers wanting reassurance about which household bugs pose genuine risks, the guide to insects that are not poisonous covers similar low-risk species found indoors.
Pro Tip: Sealing gaps around windows and attic vents before autumn is the most effective way to keep Asian lady beetles from moving indoors when temperatures drop.
5. June Bug/May Beetle
Few Louisiana beetles are as universally recognized as the June bug, a nighttime visitor drawn to porch lights throughout late spring and early summer. Britannica notes that June bug refers to nearly 300 species of plant-eating beetles in the genus Phyllophaga that commonly appear during warm spring evenings and are attracted to lights, a habit that makes them a familiar backyard nuisance rather than a rare find.
Adult June bugs, or May beetles, are heavy-bodied insects with shiny, red-brown wing covers. Their size ranges from about 12 to 25 millimeters, with adults feeding on foliage and flowers at night, sometimes clumsily bumping into screens and lit windows as they search for mates. While adults nibble on leaves with little lasting harm, the real damage comes from their larvae.
June bug larvae are the classic white lawn grubs that feed on grass roots underground for one to three years before pupating. A patchy, browning lawn in late summer is often the first sign of a grub problem rather than the adult beetles themselves. Homeowners in other regions dealing with similar turf pests can cross-reference the types of beetles in Kansas or the types of beetles in Missouri, since May beetle grub damage follows a similar pattern across much of the central and southern United States.
6. Bark and Ambrosia Beetles
Bark and ambrosia beetles are tiny but consequential members of Louisiana’s beetle community, particularly for anyone managing timberland or ornamental trees. A dedicated regional checklist notes that bark and ambrosia beetles in Louisiana belong to the weevil subfamilies Scolytinae and Platypodinae, a classification compiled from geographic surveys across the state.
Most species measure only a few millimeters long, with cylindrical bodies built for boring into wood rather than crawling across open surfaces. Ambrosia beetles, such as those in the genus Xylosandrus, take their name from a unique survival strategy: rather than eating wood directly, they cultivate fungus inside their tunnels. Research on the group explains that ambrosia beetles carry symbiotic fungus spores that colonize the wood and become the sole food source for adults and larvae, a partnership scientists call fungus farming.
Because ambrosia beetles bypass a tree’s chemical defenses by feeding on fungus instead of living tissue, this strategy considerably broadens the range of host trees they can successfully colonize. That adaptability makes certain species a genuine concern for stressed or freshly cut trees, since the tunnels can introduce fungal pathogens along with structural damage. Louisiana pest professionals list bark beetles among the wood-boring species worth monitoring, noting that carpet, ground, rove, bark, pine, and scarab beetles all behave differently and cause different types of damage around homes and property.
Important Note: Not every wood-boring insect found under bark is a bark or ambrosia beetle. Correct identification matters for treatment, so a sample or clear photo is often the fastest route to an accurate diagnosis from a local extension office or pest professional.
Louisiana’s beetle diversity reflects the state’s mix of wetlands, pine forests, farmland, and residential neighborhoods, and each of these six groups fills a distinct ecological role, from recycling waste to pollinating flowers to reshaping forest composition. Readers who want to keep exploring the state’s arthropod life can check out the types of spiders in Louisiana for a look at the predators that often share the same habitats, or browse the broader different types of insects found across ecosystems worldwide.
Learning to recognize these six beetle types gives any backyard naturalist or homeowner a solid starting point for identifying the far larger community of beetles sharing the Louisiana landscape.