Currently viewing the category: "Horse Flies and Deer Flies"

Subject:  Interesting little guy
Geographic location of the bug:  Ashland, Virginia, USA
Date: 09/10/2021
Time: 05:02 PM EDT
Your letter to the bugman:  Found this guy in a shallow puddle. It was interesting how it flung it’s back end to “swim”.
How you want your letter signed:  Sgt_M

Horse Fly Larva

Dear Sgt_M,
This is a Horse Fly Larva.  Many species of Horse Flies have aquatic larvae.

Subject:  What is this?
Geographic location of the bug:  Oxfordshire, UK
Date: 09/04/2021
Time: 06:11 PM EDT
Your letter to the bugman:  My friend’s son found this wee fella today (4th September 2021) near a boggy marsh in rural Oxfordshire, UK. We have no idea what it might be and wondered if you could help?
How you want your letter signed:  Sonja

Horse Fly Larva

Dear Sonja,
This sure looks like a Horse Fly larva to us, and we have received numerous reports this summer of Dark Giant Horse Flies from the UK here, and here, so it makes sense that this is the larva of a Dark Giant Horse Fly.

Subject:  Is it a Fly?
Geographic location of the bug:  Madison, Florida
Date: 08/13/2021
Time: 06:56 AM EDT
Your letter to the bugman:  Can’t find anything like it in my bug books.
Have not found on any web searches. Is it a fly or a moth?
How you want your letter signed:  Farmer Bob

Horse Fly: Leucotabanus annulatus

Dear Farmer Bob,
This is definitely a fly and the large, close set eyes indicate a male.  We were nearly certain this is a Horse Fly but we cannot ever remember seeing a white Horse Fly.  Our web search quickly brought up a FlickR posting of
Leucotabanus annulatus. We then confirmed its identity on BugGuide and learned the preferred habitat is “places where there are trees and rotting wood.”  We are very excited as this is a new species for our site and it is a magnificent species.  As an aside, female Horse Flies suck the blood of warm blooded animals and they will bite humans if there is no other source of blood.  Males do not bite, do not feed on blood and pose no threat to humans.

Subject:  Big mean looking fly
Geographic location of the bug:  Southeastern PA – Kennett Square
Date: 08/09/2021
Time: 02:20 PM EDT
Your letter to the bugman:  Hi there bugman,
This extra-large fly was on my window and I want to know if I should be afraid or not.
How you want your letter signed:  Thanks! – Jessica

Female Horse Fly

Dear Jessica,
This is a female Horse Fly in the genus
Tabanus, and we believe based on BugGuide images that it might be Tabanus abdominalis, or possibly Tabanus limbatinevris which is also pictured on BugGuide.  Female Horse Flies are blood suckers that feed off livestock wild animals, but they will bite humans if there is no other prey.

Subject:  huge black fly on awning to be out of the rain
Geographic location of the bug:  smyrna delaware 19977
Date: 08/09/2021
Time: 08:53 PM EDT
Your letter to the bugman:  Exactly 1.25 inches long. I have never seen a fly this large, ID??
How you want your letter signed:  moliken

Male Black Horse Fly

Dear Moliken,
This is a male Black Horse Fly,
Tabanus atratus.  Observe how close together the eyes are spaces.  That is a sign it is a male.  Female Horse Flies have a noticeable space between the eyes.

Subject:  Giant  Horsefly???
Geographic location of the bug:  Bournemouth UK
Date: 07/17/2021
Time: 10:33 AM EDT
Your letter to the bugman:  Is this a Giant Dark Horsefly? It landed in the garden yesterday and we were curious.
How you want your letter signed:  Jane B

Dark Giant Horse Fly

Dear Jane,
We agree with you that this is a Dark Giant Horse Fly and it appears to be a female.