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

Subject:  Is this a dirt dauber or a wasp?
Geographic location of the bug:  Shreveport, La
Date: 07/09/2018
Time: 10:17 PM EDT
Your letter to the bugman:  These have been tunneling in our yard and under the foundation of our house. We can’t figure out what it is.
How you want your letter signed:  Thanks for the help

Mydas Fly

This is not a Wasp.  It is a Mydas Fly and it is an effective wasp mimic.  We believe we have correctly identified your Mydas Fly as Mydas chrysostomus thanks to this BugGuide image.  Of the family, BugGuide notes:  “Life cycle details not known for many groups; generally, larvae live in decaying wood or soil; some known to prey on beetle larvae” and that should explain why they are tunneling in your yard.  Mydas Flies are harmless, so you have no cause for concern.

Mydas Fly

What's That Bug? does not endorse extermination

Subject:  Hornet?
Geographic location of the bug:  Greenville, SC
Date: 07/03/2018
Time: 03:21 PM EDT
Your letter to the bugman:  It looks like a very large beetle with a bee’s abdomen, about 2″ long. Wings are purple – ish.
Any ideas?
How you want your letter signed:  Gerri Johnston

Mydas Fly

Dear Gerri,
This is not a Hornet.  It is a Fly, and because of the clubbed antennae and the orange band on the abdomen, we are pretty confident it is a Mydas Fly, most likely
Mydas clavatus.  According to BugGuide:  “With the black-and-orange pattern, it resembles a wasp and fools the casual observer.”

What's That Bug? does not endorse extermination

Subject:  What’s this?
Geographic location of the bug:  Browns Mills, New Jersey
Date: 07/05/2018
Time: 04:24 PM EDT
Your letter to the bugman:  I just would like to know what kind of bug this is, tried to search myself but no exact match.
How you want your letter signed:  Thank you, Holly.

Mydas Fly

Dear Holly,
This is a Mydas Fly,
Mydas clavatus, and it is generally believed that this harmless species mimics stinging wasps for protection.  While this mimicry will work on many predators, it does not work with humans that have a morbid and irrational fear of wasps.  This individual does not appear to have met a natural death.  Here is a BugGuide image for comparison.

What's That Bug? does not endorse extermination

Subject: What is this
Location: Peoria AZ
August 15, 2017 9:56 am
Hi I am trying to figure out what type of insect this is, we have had several of them in and around our pool.
Signature: Thanks Lora

Mydas Fly

Dear Lora,
Your image is quite blurry, but we believe we have identified this Fly with an orange abdomen as the Mydas Fly
Stratiomydas lividus based on this BugGuide image.  Of the genus, BugGuide states:  “A single species in our area” and it has a range of “AZ to Costa Rica + Peru.”

What's That Bug? does not endorse extermination

Subject: Black, winged, velvety
Location: Sioux Falls, SD
August 4, 2017 11:24 am
I have seen this particular bug in Branson, MO and Sioux Falls, SD. I’ve looked at a lot of “bug” sites but just can’t quite nail this down. The body seems to be “velvety”. I have not determined if it is a stinging insect . What do you say? Thanks for any help you can provide.
Signature: *S*

Mydas Fly

Dear *S*,
This is a Mydas Fly,
Mydas clavatus, and you can compare your image to this BugGuide image to verify our identification.  According to BugGuide:  “Large black fly with red/orange mark on top (dorsum) of 2nd abdominal segment. Body hairless, cylindrical. Eyes large. Antennae are distinctively clubbed in the Mydidae. This species flies rather boldly in the open. With the black-and-orange pattern, it resembles a wasp and fools the casual observer.”

Thank you for the information. I’ve looked at your suggested site and see that is obviously what we have. Thanks again. *S*

What's That Bug? does not endorse extermination

Subject: What is it?
Location: Pinon Hills, CA
June 22, 2017 5:13 pm
Southern California High Desert against the foothills of Mt. High. June 22, 2017 at around 1pm. I have narrowed it down but am confused and cannot find an exact match to what it is. I have attached pics. Please help. If it’s a mosquito it looks horrendous.
Thank you,
Signature: Tim

Mydas Fly: Rhaphiomidas acton

Dear Tim,
At first we thought this must be a Bee Fly, but we believe we have correctly identified it as a Mydas Fly,
Rhaphiomidas acton, thanks to images on BugGuide.  Of the genus, BugGuide indicates the habitat is:  “Sandy habitats in relatively arid locales.”  Your individual appears to be a female, and we found this image of a male on FlickR.  There is also an amazing image of the emergence from the pupa on BugGuide.

Mydas Fly: Rhaphiomidas acton

Mydas Fly: Rhaphiomidas acton

Mydas Fly: Rhaphiomidas acton

What's That Bug? does not endorse extermination