Ablautus basini

Distinguished from similar small Asilidae by its small size (6-7 mm), sand coloration, and the sexually dimorphic facial hair coloration (white in males, gold/ochre in females). The genus Ablautus can be separated from other small robber fly genera by genitalic characters and specific wing venation patterns; species-level identification requires examination of type specimens or detailed taxonomic keys.

Small robber fly measuring approximately 6-7 millimeters in length. Sand-colored body provides camouflage in its habitat. Males have bright white facial hairs (mystax), while females have gold or ochre-colored facial hairs. Males are slightly smaller and more slender than females. Like other Asilidae, possesses a mystax of stiff facial bristles thought to protect the face during prey capture.

Sandy or open ground habitats in plains and semi-arid regions. Associated with early spring conditions in temperate areas.

Great Basin region of western North America. The specific epithet 'basini' refers to this geographic association.

Active in early spring. Adults have been observed courting and mating during this period.

Predatory on small insects. Has been observed capturing leafhoppers (Cicadellidae).

Incomplete metamorphosis with egg, larva, pupa, and adult stages. As with other Asilidae, larvae are likely predatory in soil or decaying organic matter, though specific details for this species are not documented.

Males perform elaborate courtship displays: they alight near stationary females, fly and alight repeatedly, sometimes sidling into different positions, eventually waving their front legs and rocking up and down in front of the female. Once engaged in courting, males are not easily frightened away. Adults are sit-and-wait predators that capture prey in flight or from perches.

Predator of small insects, potentially contributing to regulation of leafhopper populations. Serves as prey for larger invertebrates and possibly small vertebrates.

• Other Ablautus speciesGenus members share small size, sand coloration, and spring activity; require genitalic examination for species-level separation
• Other small Asilidae (e.g., some Stenopogoninae)Similar size and predatory habits; distinguished by facial hair coloration dimorphism and specific wing venation in Ablautus

• robber fly
• predator
• spring-active
• sexual dimorphism
• courtship display
• Great Basin

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• Catalogue of Life
• Times Flies When You're Studying Flies! Bohart Museum Open House Jan. 12 | Bug Squad
• Bug Eric: Courting Robber Flies