Brachynemurus nebulosus

Adults can be distinguished from damselflies by their clubbed antennae and wing venation patterns. Within the genus Brachynemurus, B. nebulosus can be identified by its specific wing patterning—characterized by a nebulous or clouded appearance to the wing markings, as suggested by the species epithet 'nebulosus' (meaning cloudy or foggy). The genus Brachynemurus is distinguished from other antlion genera by wing morphology and genitalia structure.

Larvae inhabit dry, sandy or powdery soils, often in sheltered situations such as beneath rock overhangs, under bridges, in the dirt floors of old barns and sheds, or at the base of trees. Adults are typically found in tall grasses and vegetation, especially at dusk, where their cryptic coloration allows them to blend seamlessly against substrates.

North America, with records spanning the United States and southern Canada. The species has been documented from diverse regions including the eastern United States, the Great Plains, and western states.

Adults are most commonly observed during late spring through summer, with peak activity typically occurring in May through July. Larvae are present year-round in suitable soil substrates, pupating in silken cocoons underground.

Larvae are predatory, feeding on ants and other small invertebrates that encounter their submerged jaws. They inject digestive enzymes through hollow mandibles to liquefy prey tissues, then imbibe the resulting fluids. Adults have reduced mouthparts and do not feed, or feed only sparingly on nectar or other liquids.

Complete metamorphosis: eggs are laid in soil; larvae develop through instars as ambush predators; mature larvae spin silken cocoons underground incorporating sand grains; pupation occurs within the cocoon; adults emerge to mate and disperse. Larvae do not construct pit traps, instead remaining buried at the soil surface.

Larvae are sit-and-wait ambush predators that remain motionless with jaws agape. When prey contacts the jaws, they snap shut and the larva injects paralyzing enzymes. Adults are weak, clumsy fliers most active at dusk. They exhibit remarkable crypsis, aligning their bodies against grass stems or twigs to become essentially invisible. Adults are frequently attracted to lights at night.

Larvae function as predators of small soil-dwelling arthropods, potentially regulating ant and other insect populations in dry soil habitats. Adults serve as prey for various insectivores including birds, bats, and predatory insects. The species contributes to nutrient cycling through predation and decomposition processes.

Larvae are familiar to children and naturalists as 'doodlebugs,' celebrated for their intriguing predatory behavior. The species has no agricultural significance but contributes to biodiversity in natural and semi-natural habitats. Adults occasionally appear at porch lights, providing opportunities for observation.

• Myrmeleon spp.Pit-digging antlions whose larvae construct characteristic funnel-shaped traps in sand; distinguished from Brachynemurus by larval behavior and adult wing patterns
• Scotoleon spp.Another genus of pit-digging antlions with similar adult morphology but distinct wing patterns and male genitalia
• Glenurus spp.Antlions with striking black, white, and pink wingtip coloration; much more visually distinctive than the subdued patterning of Brachynemurus

• antlion
• Neuroptera
• predator
• cryptic
• North America
• doodlebug
• ambush predator

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Bembicid Holdings | Entomology Research Museum
• Meloidae Holdings | Entomology Research Museum
• Bug Eric: Wasp Wednesday: Hoplisoides nebulosus
• Bug Eric: July 2012
• Bug Eric: "Doodlebugs" (Antlions)
• Acanthaceae | Beetles In The Bush