'Black Horse Fly' Photograph by Ryan Van Meter

Black Horse Fly

Massive 1½-Inch-Long Fly

Likely a female, by far the largest fly I've ever seen.
© 1980-2026 — Ryan Van Meter — All Rights Reserved — No Reuse Without Permission — License

More Observations from Expedition Mid-Atlantic

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

25 Observations
16 Identified Species
Blue Grosbeak
(July 2023)
Common Watersnake
Blackwater National Wildlife Refuge, Maryland, USA (July 2023)
The Red Fox and the Rabbit
Blackwater National Wildlife Refuge, Maryland, USA (July 2023)
Juvenile Osprey
Great Blue Heron
Bombay Hook National Wildlife Refuge, Delaware, USA (July 2023)
Sika Deer
Blackwater National Wildlife Refuge, Maryland, USA (July 2023)

More from Biodiversity Arthropoda of the World

55 Observations
48 Identified Species
Rosy Maple Moth Close-Up Portrait
Pawlet, Vermont, USA (June 2025)
Shamrock Orbweaver Spider
Pawlet, Vermont, USA (September 2011)
Great Spangled Fritillary Butterfly
Pawlet, Vermont, USA (June 2010)
Spreadwing Damselfly Mating
Pawlet, Vermont, USA (July 2019)
Northern Paper Wasp
Pawlet, Vermont, USA (September 2010)
Filmy Dome Spider
Pawlet, Vermont, USA (April 2023)
© 1980—2026 RYAN VAN METER