Nick Upton / Striped slender robber fly (Leptogaster cylindrica) with insect prey, Corfe Common, Dorset, UK, July.

Andy Sands / Robberfly (Leptogaster cylindrica) in early morning dew, Hertfordshire, England, UK. July. Focus stacked image.

Nick Upton / Violet black-legged robber fly (Dioctria atricapilla) with Dashed slender robber fly (Leptogaster guttiventris) prey, chalk grassland meadow, Wiltshire, UK, June.

Alex Hyde / Striped slender robberflies (Leptogaster cylindrica) pair roosting after mating. Bestwood Country Park, Nottinghamshire, UK. June. Focus stacked.

Doug Wechsler / Robber fly (Leptogaster sp.) tangled up with another predatory fly in a spider's web, Camp Woods Preserve, Pennsylvania, USA. July.

Alex Hyde / Cave fungus gnat (Speolepta leptogaster) pupa. This colony was found in a long-abandoned lead mine. Peak District National Park, Derbyshire, UK. March.

Alex Hyde / Cave fungus gnat (Speolepta leptogaster) larva. Often considered a troglobite as the larvae have not. This colony was found in a long-abandoned lead mine. Peak District National Park, Derbyshire, UK....

Oliver Wright / Striped slender robberflies (Leptogaster cylindrica). Ledston, Yorkshire, UK, June. Focus stacked.

Oliver Wright / Striped slender robberfly (Leptogaster cylindrica) close up of head, Ledston, Yorkshire, England, UK, July. Focus stacked image.

Oliver Wright / Striped slender robberflies (Leptogaster cylindrica). Ledston, Yorkshire, England, UK, June. Focus stacked image.

Oliver Wright / Striped slender robberflies (Leptogaster cylindrica). Ledston, Yorkshire, England, UK, June.

Oliver Wright / Striped Slender Robberfly (Leptogaster cylindrica) Ledston, Yorkshire, July. Focus stacked image.