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

Subject:  Giant Tachinid Fly
Geographic location of the bug:  Arlington, WA
Date: 10/10/2017
Time: 02:13 PM EDT
I have two what looks like Giant Tachinid flies on my mint outside this week.  I took a number of photos as it looked way different than any I’ve seen.  It really looks like Giant, but according to all research I have found, its not located anywhere here .. only Europe and that region.   Are there Giant species here?  This was the size of a larger bumblebee.. so I noticed it at once.. stiff bristles on a smooth black body with orange head and wings.. so it stood out.    Funny enough the photos I find are all in the UK on mint as well.  Thank you for any clarification on this species.
How you want your letter signed:  Sammy Catiis

Tachinid Fly

Dear Sammy,
Tachinid Fly is a name used for a member of the parasitoid family Tachinidae.  According to BugGuide, a site dedicated to North American sightings:  “Second largest dipteran family (after Tipulidae), with ~1350 spp. in >300 genera of 4 subfamilies in our area(1) and >10,000 spp. in ~1600 genera worldwide; it is possible that only half of the species have been described.”  We searched for images of the Giant Tachinid Fly, and we found an image on Alamy from Wales that is identified as
Tachina grossa and it has a light collar of hairs behind the head, a distinctive feature also found on your individual.  The genus is also found in North America, and this BugGuide image also has the light collar.  Data indicates the genus is found in Washington.  Congratulations on identifying your individual to the genus level.  According to BugGuide “40 spp. in 2 subgenera in our area”  but most of the individuals posted to BugGuide are not identified to the species level, so we suspect they are difficult to identify from images.

Tachinid Fly

What's That Bug? does not endorse extermination

Subject:  Fly species?
Geographic location of the bug:  Creighton, KZN, South Africa
Date: 10/10/2017
Time: 10:21 AM EDT
Found this indoors, looks like a fly, but never seen this one before.
Thought it was Rhachoepalpus immaculatus, but coloring not the same.
How you want your letter signed:  Terence

Tachinid Fly

Dear Terence,
This is a parasitoid Tachinid Fly.  According to Animal Diversity Web
Rhachoepalpus immaculatus is a Tachinid Fly.  Tachinidae is a large family with many similar looking individuals, so we cannot say for certain if your identification is correct to the species level, but you do have the family correct.

Thanks for the prompt responce.
Greatly appreciated.

What's That Bug? does not endorse extermination

Subject:  Fly identification
Geographic location of the bug:  Idaho
Date: 09/15/2017
Time: 11:16 PM EDT
Dear Mr. Bugman,
I took a photo of a large, mostly black fly with two white dots on the rear part of its abdomen. I have only found the fly outside once. All other flies inside my house are plain black with no white dots. I have attempted to find the type of fly online but with no luck so far. If you know what type it is I’d be very interested to hear. Thank you for your time and help!
How you want your letter signed:  Sincerely, Sarah

Tachinid Fly

Dear Sarah,
This is a parasitoid Tachinid Fly, and according to BugGuide, there are  “1350 spp. in >300 genera of 4 subfamilies in our area [North America].”  We quickly scanned BugGuide down to the tribe level and could not locate this particular species.  Tachinid Flies are important biological control agents against other insects and arthropods, and according to BugGuide:  “Larval stages are parasitoids of other arthropods; hosts include members of 11 insect orders, centipedes, spiders, and scorpions. Some tachinids are very host-specific, others parasitize a wide variety of hosts. The most common hosts are caterpillars. Most tachinids deposit their eggs directly on the body of their host, and it is not uncommon to see caterpillars with several tachinid eggs on them. Upon hatching the larva usually burrows into its host and feeds internally. Full-grown larva leaves the host and pupates nearby.”  If time permits, we will try to identify your Tachinid Fly to the species level, but now you also know where to do the research.  If you find a visual match, please let us know.

What's That Bug? does not endorse extermination

Subject: What species of fly is this?
Location: Clinton, Maine
August 18, 2017 1:48 pm
This is a fly my son found in our flower garden. It is summertime here in Maine and I don’t recall ever seeing this fly! We have many living next to a farm, but this little guy is quite exquisite! Can you tell me what he is please?
Signature: Kristy Richard

Tachinid Fly: Belvosia borealis

Dear Kristy,
This is a parasitoid Tachinid Fly, and we are quite confident it is
Belvosia borealis because of its similarity to this BugGuide posting, also from Maine.  According to BugGuide, the larvae feed “on Ceratomia spp. (Sphingidae).”

Tachinid Fly: Belvosia borealis

Tachinid Fly: Belvosia borealis

What's That Bug? does not endorse extermination

Subject: Tersa Sphinx Moth
Location: Apopka, FL
August 16, 2017 1:31 pm
Found this moth on my house, took this picture then noticed something on it that seemed to be eating into it’s side. I destroyed the thing and the moth few up to the ceiling where it is now. My question is what is the thing?
Signature: Jill

Tersa Sphinx with parasite

Dear Jill,
We suspect this might be a Dipteran parasite, perhaps a Tachinid Fly, on this Tersa Sphinx.  It is possible the infestation occurred while this moth was still a caterpillar.  We are currently searching unsuccessfully, for evidence of Tachinid Flies using Sphinx Moths as hosts.  The Moth Photographers Group has a nice parasite page.

What's That Bug? does not endorse extermination

Subject: Orange hairy butt fly
Location: Central NY, south of Ithaca
July 31, 2017 7:53 am
I was intrigued by this fly whilst walking my dog early one morning in late July. It was relatively slow moving and stuck around the same plant for a few minutes. It was the size of a large housefly. I encountered it on a mowed walking path near some grain fields at the edge of state forest land, in the Finger Lakes region of New York State. What is this delightful creature?
Signature: Andrea

Tachinid Fly

Dear Andrea,
This is a parasitoid Tachinid Fly or Bristle Fly, but we are uncertain of the species as there are many similar looking species in this very large family.

What's That Bug? does not endorse extermination