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

Subject: What kind of insect is this?
Location: Wesley Chapel, Florida
April 11, 2015 7:42 am
Hello Bugman,
I have a butterfly garden in Florida and have found many strange insects but cannot figure out what this little guy is.
Any information is much appreciated!
Signature: Michele M.

Male Horse Fly:  Chlorotabanus crepuscularis

Male Horse Fly: Chlorotabanus crepuscularis

Dear Michele,
This is really a gorgeous image of a male Horse Fly. We verified its identity as
Chlorotabanus crepuscularis on BugGuide where it states: “Females feed on mammalian blood.  …  As with all the blood-feeding tabanids, the females are responsive to Carbon Dioxide. I caught over 500 females in one night with a trap baited with dry ice in coastal South Carolina. Will also come to lights at night.  Regarded as a pest species in Florida.”  The closeness of the eyes indicates that this is a non-biting male Horse Fly.  Female Horse Flies have a space between the eyes.

Wow!  A horse fly!
I never would have guessed!
I love insects and never use pesticides.  I just love seeing their beauty up close.
Amazing!!!
Thanks so much for your speedy answer and expertise,
Michele Mistretta

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What's That Bug? does not endorse extermination

Subject: Weird Bug From Pond
Location: Lake View, AL, 35111
September 9, 2014 11:00 am
Hey Bugman,
I have some strange bug crawling around my pond and sidewalks. They seem to move like worms.
They’re greyish brown and I haven’t been brave enough to pick one up and check it out.
I live in Lake View, AL
Thanks,
Jared
Signature: McCalla Bugster

Horse Fly Larva

Horse Fly Larva

Dear McCalla Bugster,
This looks to us like the immature stage of a fly, possibly a Horse Fly.

What's That Bug? does not endorse extermination

Subject: cicada killer wasp??
Location: Mason, MI
September 6, 2014 8:35 pm
This is the 2nd time I’ve seen this insect–both times I was inside my car. The first time I was driving when my son noticed it on the windshield and it stayed put until my speed reached about 50-55 mph. This one landed on my car when I reached my destination and I hadn’t gotten out yet. So I took a picture so I could try to identify it later. It’s at least 1 inch or bigger and I thought the first one looked like it had striped-like markings of a wasp but this one doesn’t appear to have those as much but it could be the angle of the picture. A friend thought it might be a cicada killer wasp but I wasn’t as convinced.
Signature: Sandra

Horse Fly

Horse Fly

Dear Sandra,
This is a Horse Fly, not a Cicada Killer.

What's That Bug? does not endorse extermination

Subject: strange fly
Location: Chesapeake va
August 7, 2014 4:19 pm
Just curious what kind of fly this is..never seen anything like it. It landed on me and scared me half to death..lol
Signature: Christina

Male Black Horse Fly

Male Black Horse Fly

Dear Christina,
You can tell by the close set eyes that this Black Horse Fly,
Tabanus atratus, is a male.  You can compare your image to this image on BugGuide.  Only female Horse Flies bite and suck blood.  Males take nourishment from fruit.  According to BugGuide:  “Females feed on mammalian blood, while males, which lack mandibles, feed on nectar and plant juices (Long 2001). This species especially prone to attack cattle and other livestock.”

What's That Bug? does not endorse extermination

Subject: Interesting fly
Location: North Kingstown, RI
July 21, 2014 6:47 am
This fly (at least I think it’s a fly) was on my car in North Kingstown, RI on July 20, 2014. I’ve never seen one like this before.
I tried searching google images, but nothing came up that looked like this.
Can you tell me what it is?
Thanks,
Signature: Gary Brownell

Male Horse Fly

Male Horse Fly

Hi Gary,
The close-set eyes indicate that this Horse Fly in the family Tabanidae is a non-biting male.  Biting female Horse Flies have a space between the eyes.  See this Horse Fly eye comparison from our archives.  A dorsal view would make species identification easier.

Thanks. I guess I’ve never looked closely at one of these before. It was the white eyes that caught my attention…
Gary Brownell

We believe the faceted eyes are most likely not pigmented white, but rather reflecting the light from the sky.

Interesting. They didn’t seem to change color as the fly changed position. Unfortunately, I only got pictures from this one angle, so I can’t be sure about all that in hindsight. But it was definitely the white eyes that drew my attention.
Thanks,
Gary Brownell

What's That Bug? does not endorse extermination

Subject: Large black insect – southern Ohio
Location: Southwest Ohio
July 3, 2014 2:04 am
I saw this large, all black insect flying outside our house early yesterday morning. It flew fairly slowly and landed near our garage. It seemed to have almost a “matte” finish . And it was about an inch long. Any idea what it is?
Signature: Adam

Black Horse Fly

Black Horse Fly

Hi Adam,
This is a Black Horse Fly,
Tabanus atratus, and the space between the eyes indicates she is a biting female.

What's That Bug? does not endorse extermination