Black Horse Fly

Massive 1½-Inch-Long Fly

Likely a female. By far the largest fly I've ever seen.

17 July 2023

© 2023 — Ryan Van Meter — All Rights Reserved — No Reuse Without Permission — License

Bombay Hook National Wildlife Refuge, Delaware, USA

More Observations from Expedition Midlantic

A survey of species of the Blackwater National Wildlife Refuge (MD) and the Bombay Hook National Wildlife Refuge (DE) (July 2023)

25 Observations

17 Identified Species

Osprey

Blackwater National Wildlife Refuge, Maryland, USA

Flock of Avocet

Bombay Hook National Wildlife Refuge, Delaware, USA (July 2023)

Red-Winged Blackbird Male Perched on Great Mullein

Bombay Hook National Wildlife Refuge, Delaware, USA (July 2023)

Territorial Dispute on the Tidal Flats Egret & Heron Vie for Tidal Fishing Spot

Bombay Hook National Wildlife Refuge, Delaware, USA (July 2023)

Marsh Wren

Bombay Hook National Wildlife Refuge, Delaware, USA (July 2023)

Swamp Rose Mallow

Bombay Hook National Wildlife Refuge, Delaware, USA (July 2023)

More from Biodiversity Arthropoda of the World

60 Observations

52 Identified Species

Rare Species of Sawfly

Pawlet, Vermont, USA (May 2019)

Eastern Pondhawk Dragonfly Adult Male

Pawlet, Vermont, USA (July 2019)

Six-Spotted Tiger Beetle

Pawlet, Vermont, USA (June 2025)

Fierce Orbweaver Spider

Pawlet, Vermont, USA (August 2025)

Filmy Dome Spider

Pawlet, Vermont, USA (April 2023)

Autumn Meadowhawk Dragonfly

Black Horse Fly

Massive 1½-Inch-Long Fly

Likely a female. By far the largest fly I've ever seen.

17 July 2023

© 2023 — Ryan Van Meter — All Rights Reserved — No Reuse Without Permission — License

Bombay Hook National Wildlife Refuge, Delaware, USA

A survey of species of the Blackwater National Wildlife Refuge (MD) and the Bombay Hook National Wildlife Refuge (DE) (July 2023)

25 Observations

17 Identified Species

Blackwater National Wildlife Refuge, Maryland, USA

Bombay Hook National Wildlife Refuge, Delaware, USA (July 2023)

Bombay Hook National Wildlife Refuge, Delaware, USA (July 2023)

Bombay Hook National Wildlife Refuge, Delaware, USA (July 2023)

Bombay Hook National Wildlife Refuge, Delaware, USA (July 2023)

Bombay Hook National Wildlife Refuge, Delaware, USA (July 2023)

60 Observations

52 Identified Species

Pawlet, Vermont, USA (May 2019)

Pawlet, Vermont, USA (July 2019)

Pawlet, Vermont, USA (June 2025)

Pawlet, Vermont, USA (August 2025)

Pawlet, Vermont, USA (April 2023)

Ward Marsh, West Haven, Vermont, USA (September 2020)

© 1980—2026 RYAN VAN METER