Currently viewing the category: "Horse Flies and Deer Flies"
What's That Bug? does not endorse extermination

Subject:  Mysterious Tabanus
Geographic location of the bug:  Ottawa, Ontario, Canada
Date: 08/09/2019
Time: 10:08 PM EDT
Your letter to the bugman:  Hello bugman!
I found this large (1-1 1/2″) and very slow-flying horse fly on the trim of my car a few mornings ago. Only when I poked it with a stick did it finally fly around a bit and in a manner that almost reminded me of a bumblebee, flying with abdomen hangings down slightly. It stayed in the same area of our garage door for 24 hours. Every time my camera flash lit up, both for pre-flash and actual picture, the fly kind of jumped, as if it was scared or pained by the flash on my old Samsung A5 phone camera. But it never actually flew or even moved it’s feet much because of the flash, just sort of jumped on the spot.
I’m certain this is in the Tabanus genus thanks to a lot of googling, but cannot determine the species. The closest I can come is maybe Tabanus superjumentarius. Thoughts?
Thank you,
How you want your letter signed:  Mike L. in Ottawa

Horse Fly

Dear Mike L. in Ottawa,
We are going to go with
Tabanus catenatus which is pictured on BugGuide and is reported from Ontario on BugGuide.  The space between the eyes indicates this individual is a female.

Horse Fly

What's That Bug? does not endorse extermination

Subject:  green eyed wasp imposter
Geographic location of the bug:  Kiyikoy, Turkey
Date: 06/23/2019
Time: 04:41 AM EDT
Your letter to the bugman:  Can anyone tell me what this is and a bit more about it? I’ve been told it’s not a wasp and doesn’t sting but I don’t trust yellow and black flying things. It’s larger than a normal UK wasp.
How you want your letter signed:  Domino

Horse Fly

Dear Domino,
This is a Horse Fly in the family Tabanidae, and females bite larger animals like horses, cattle and other livestock, sucking blood as they feed.  They are opportunistic and will bite humans if there is no other available prey.  Based on Diptera Info, it might be
Tabanus promesogaeus and the person who submitted the images claims:  “Common and very ready to bite painfully as I know to my cost…”

What's That Bug? does not endorse extermination

Subject:  Grasshopper fly mix
Geographic location of the bug:  Enschede, The Netherlands
Date: 06/16/2019
Time: 08:00 AM EDT
Your letter to the bugman:  What’s the name of this bug? It appears to have two small “fangs” and rainbow colored eye’s, it’s not shy nor aggressive, i could easily touch it. Thanks.
How you want your letter signed:  Kevin Hoekstra

Female Notch Horned Cleg

Dear Kevin,
Though we were confident that this is a female Horse Fly in the family Tabanidae, there were enough features to cause us to consider it might be a member of a different family, but we quickly located the Notch Horned Cleg,
Haematopota pluvialis, on Influential Points  where it states:  “The female Haematopota pluvialis has distinctively patterned hairy eyes – the eye stripes extend over most of the eye.”  The site also states:  “There are of course innumerable accounts of Haematopota pluvialis biting man, especially in upland areas where clegs can turn a pleasant walk into an endurance course. Our own experience in the Scottish Highlands is that when the sun is out, the clegs bite; when the sun goes in the midges bite! Flight (and hence feeding) activity of Haematopota pluvialis is dependent on a sufficiently high humidity and temperature (Krčmar, 2004).”

Yes! That’s it, thank you! In Dutch it appears to be “Regendaas”.
Regards,
Kevin Hoekstra

What's That Bug? does not endorse extermination

Subject:  Weird worm like creature found in water
Geographic location of the bug:  Petersburg, Tennessee
Date: 04/29/2019
Time: 09:20 PM EDT
Your letter to the bugman:  I was going outside catching tadpoles to grow and I can across this worm like thing. I scooped him up and put him in with the tadpoles. Maybe he wasn’t originally in the water and he fell in? But I didn’t want to take the chance. I’ve looked up tons of worm like creatures and even asked my parents to no avail. It would be appreciated greatly if you could help figure this mystery out. Thanks in advance.
How you want your letter signed:  Sierra

Horse Fly Larva

Dear Sierra,
We believe this is a Horse Fly larva.  According to Quora:  “
Most horse flies are associated with water, and the carnivorous larvae can be found therein. I have collected black horse fly larvae while searching through the muck and mud at pond edges. [T]Here’s a Colorado State University photo by Jennifer Bonnell of what is probably a black horse fly larva eating a small frog; they’ll also eat other insects, and, while I’ve never seen it, I’m sure they’ll eat any weakened or trapped minnows they might be able to.  Through the summer, the larvae grow in the water through 6–9 instars, and ultimately spend the winter in the the mud in their last instar. In spring, still in the muck and mire, they pupate and a few weeks later, the adults emerge.”  You might not want to keep this predatory Horse Fly larva with your tadpoles.

What's That Bug? does not endorse extermination

Subject:  Frozen Like Han Solo
Geographic location of the bug:  a pond in northern IL
Date: 12/10/2018
Time: 11:07 PM EDT
Your letter to the bugman:  Hi.  We were hiking in the woods and saw a few of these trapped in the ice of two different shallow ponds near our home.  Each specimen was about 2 to 2.5 inches long.  I thought it must be a larvae of a pond insect, but I haven’t been able to find any that are supposed to be that big.  Any ideas?
How you want your letter signed:  Mary

Horse Fly Larva

Dear Mary,
This looks to us like the larva of a Horse Fly.  There is a matching image on Quora where it states:  “Most horse flies are associated with water, and the carnivorous larvae can be found therein.”

Thank you! and Yuck!
I appreciate your help.  I always attempt to do my own identifying, but whenever I am stuck, you always come through.
My curiosity thanks you.
Mary
What's That Bug? does not endorse extermination

Subject:  Large fly like bug
Geographic location of the bug:  Ontario, Canada
Date: 08/08/2018
Time: 10:08 PM EDT
Your letter to the bugman:  Hello! What’s this bug? It was on the wall outside my store …It’s horrifying and I must know if it is a horsefly or cicada or another insect I haven’t thought of..
How you want your letter signed:  Sparkledemon

Horse Fly

Dear Sparkledemon,
This is definitely a Horse Fly and it looks to us like
Tabanus marginalus pictured on BugGuide, and it is very curious that though BugGuide states: “The most common biting horse fly throughout the world” there are only three images posted there and all are from a limited area in the Northeastern portion of North America, including Ontario.

What's That Bug? does not endorse extermination