Currently viewing the category: "Bot Flies"
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upstate ny, came out of dead rabbit
Location: Greene County, NY
July 24, 2011 4:44 pm
Have no clue.. it is alive and crawls around.. found it while cleaning a dead rabbit can you help
Signature: FoX83

Bot Fly Larva

Hi FoX83,
This is the larva of a Rodent Bot Fly in the genus
Cuterebra.  The larvae are endoparasites found on certain mammals.  The Bot Fly larva forms a warble, generally on the neck of the infested host, and though they look quite nasty, they are alleged to not harm the host.

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Black & white bee?
Location: Washington wetland field
July 19, 2011 10:58 am
Help me find out what this is. It was seen in a wetland field here in the state of Washington. It’s the same size as a bumble bee. I didn’t see it fly, it does appear to have wings. It is also fuzzy like a bumble bee. Thanks
Signature: P Lind

Rodent Bot Fly

Dear P Lind,
You have encountered a Rodent Bot Fly in the genus
Cuterebra.  According to BugGuide:  “Females typically deposit eggs in the burrows and “runs” of rodent or rabbit hosts. A warm body passing by the eggs causes them to hatch almost instantly and the larvae glom onto the host. The larvae are subcutaneous (under the skin) parasites of the host. Their presence is easily detected as a tumor-like bulge, often in the throat or neck or flanks of the host. The larvae breathe by everting the anal spiracles out a hole (so they are oriented head-down inside the host). They feed on the flesh of the host, but only rarely does the host die as a result.”

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Looks like a bumblebee with a fly bottom?
Location: Petawawa, Ontario
June 8, 2011 10:36 pm
When I found this lovely critter beside my pool, I thought it must be a half-drowned bumblebee as it’s about the same size and shape as a bumblebee. I poked it gently with a stick to see if it was alive,and it squirted something out of it’s rear end in a stream of what I figured was some sort of venom. (It got some distance with the spray, too, about 12 inches in a fine arc onto my lawn!)
I quickly got a bottle (and lid) from the house to carefully capture it and get a better look. It didn’t seem to have a mouth or a stinger, and had a fuzzy head but shiny bottom like a fly. Also, I noticed it didn’t have the same kind of wings as a bee. After I did some online searching and overcame the heebee jeebees, we got some clearer pics, this hefty fella was flushed down the toilet… just to be safe.
After you correctly identified our Luna Moth visitor, I knew exactly where to go for an answer on this one. Am I close with my guess that this is some type of botfly? It doesn’t have the red stripes on it’s eyes that I’ve seen from some other images, but the shape of the body and other features look familiar.
Signature: Anderson Family

Bot Fly

Dear Anderson Family,
We will leave the species identification to the experts, but you are absolutely correct in your guess that this is a Bot Fly in the genus
Cuterebra.  Of the species on bugGuide, out best guess would be Cuterebra emasculator, and there is a comment posted that includes this information:  “This is our only golden haired bot in the Northeast and this species can be found anywhere east of the Mississippi although rarely seen. It is primarily host specific in the Northeast on chipmunks, Tamias striatus.”

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Giant Fly
Location: Yakima, WA
November 1, 2010 4:18 pm
Biggest dipteran I’ve ever seen.
Signature: Paul Huffman, President-for-Life, Moclips Surf Club

Bot Fly

Hi Paul,
We strongly believed that you had submitted an image of a Bot Fly in the family Oestridae, but most individuals we have identified in the past are marked with black and white patches similar to the patterns on a Holstein milk cow.  We quickly found a matching photo on BugGuide that is identified as the Bot Fly
Cuterebra tenebrosa, and Natalie McNear from Marin County California who submitted the photo wrote:  “Looking on here it most closely resembles the New World skin bot flies of the subfamily Cuterebrinae, but I don’t see any on here that are all dark with a metallic blue abdomen.”  There is a comment by Jeff Boettner on the posting that indicates:  “I am pretty confident this one is likely Cuterebra tenebrosa. There are a few other species that have all black females, but you have shots from all angles, so likely this is correct. The bot uses Neotoma (wood rats) as a host. … There is a very robust comment dialog on that posting that is well worth the time to read.  The genus information page on BugGuide provides this information on the life cycle of the Bot Flies:  “Females typically deposit eggs in the burrows and ‘runs’ of rodent or rabbit hosts. A warm body passing by the eggs causes them to hatch almost instantly and the larvae glom onto the host. The larvae are subcutaneous (under the skin) parasites of the host. Their presence is easily detected as a tumor-like bulge, often in the throat or neck or flanks of the host. The larvae breathe by everting the anal spiracles out a hole (so they are oriented head-down inside the host). They feed on the flesh of the host, but only rarely does the host die as a result. Bot Flies are also known as Warble Flies. These Bot Flies really are quite large and they resemble bumble bees in both appearance and sound.

Bot Fly

What's That Bug? does not endorse extermination

Bot Fly?

Bot Fly

Bot Fly?
Location:  Puyallup, WA
August 24, 2010 12:21 am
After doing research on your site, I’m pretty sure this is a Female Bot Fly. What I don’t know is what type? Rodent, Rabbit, or Squirrel. I have to say after reading about them, I’m fairly grossed out. This one was buzzing around in my livingroom window. After letting her go, she hung around long enough for me to take pictures.
Your site is great! Thanks, bettyluvsduncan

Bot Fly

Dear bettyluvsduncan,
You did a very fine job identifying this unusual fly as a Bot Fly in the family Oestridae.  We believe it is
Cuterebra tenebrosa based on its dark coloration and matching it to images posted to BugGuide.  According to BugGuide:  “Hosts include Neotoma cinerea and N. lepida.”  The genus Neotoma contains Woodrats or Packrats (See link).

Bot Fly

What's That Bug? does not endorse extermination

Bot Fly?
June 15, 2010
Hi. I believe I’ve caught a Bot Fly in my house. It buzzes loudly. It’s approximately 3/4″ long. I’m curious!!!
Thanks, Barb
Orange, VA

Bot Fly

Hi Barb,
Your identification of a Bot Fly in the genus Cuterebra is correct.  We must congratulate you on the time and effort you put into trying to identify this unusual creature that has such an interesting life cycle.  We just utilized a similar catch and photograph (and hopefully release) technique with a Flesh Fly found in our own offices.  The best way to remove an insect from the home without handling it directly and without harming it is to use a glass to capture it, and then slipping a postcard under the glass.  The creature may then be photographed and released, or just released.

Bot Fly

What's That Bug? does not endorse extermination