Currently viewing the category: "Grubs"

Subject:  Never seen one of these
Geographic location of the bug:  Sieling, ok. Western Oklahoma
Date: 10/11/2017
Time: 05:09 PM EDT
This thing is bout 3/4 inch long
How you want your letter signed: 
Darrin Buntin

Ground Beetle Larva

Dear Darrin,
Immature insects are more difficult to identify with certainty than are adult insects.  We believe this is a predatory Ground Beetle larva, but we are not certain of the genus or species.

Subject: Larvae in oaks
Location: Europe
July 7, 2017 5:16 am
This larva I found under the bark of an oak. If you could help me to identify! I think it’s a buprestidae member.
Signature: Charlie

Flathead Borer

Dear Charlie,
This is indeed a Flathead Borer, the larva of a Beetle in the family Buprestidae, but alas, we are not going to be able to provide you with a species identification.  It might be the European Oak Borer,
Agrilus sulcicollis, which is pictured here and is the subject of a technical paper on

Dear Daniel, thanks for your rapid answer. I will investigate from there, even I hope to help the larva to raise an adult and make a proper id.
Best regards,

Subject: larvae or caterpillar or worm?
Location: Fontana, CA
April 6, 2017 9:29 am
I found this “bug” in the dirt of my flower garden next to the fence. My neighbors have an overflowing abundance of woodchips covering their yard. I think it came from there. Is this a worm, a caterpillar, or a larvae?
Signature: Kachina

Scarab Beetle Grub

Dear Kachina,
This is the Grub of a Scarab Beetle.  If you found it in or near the compost pile, it might be the Grub of a Figeater, commonly called a Crawlyback.

Subject: Firewood
Location: BC Canada
March 1, 2017 1:57 pm
Hi 🙂 can you tell me what kind of bug this is . I live in the Canadian Rockies . These are all over n my firewood . This guy is about an inch long he was sleeping or frozen but now that he is warm , he is very much alive ?
Signature: Rhonda

Round Headed Borer Grub

Dear Rhonda,
This is the grub of a wood boring beetle, and we strongly suspect it is a Round Headed Borer Grub from the Long Horned Borer family Cerambycidae, but we cannot provide a species identification for you.

Thank you so much 🙂 I just went and looked at more pictures and info . Super happy they are not termites . I still feel a bit sad that many do probably die in the fire ?

Subject: Bugs on Quercus ilex (Spain)
Location: Salamanca (Spain)
February 20, 2017 6:14 am
I enclose three pictures of two bugs (larva and adult) found on young Quercus ilex (inside). The larva is about 25 mm and de adults about 2 mm. They were found in Salamanca (central western Spain).
They don’t look like the usual borers in the area.
Thank you very much
Signature: Luis Carlos Jovellar (Salamanca, Spain)

Round-Headed Borer

Dear Luis,
The images of the larva you submitted appear to be Round-Headed Borers, a general name for the larvae of members of the Longhorned Borer Family Cerambycidae.  See this BugGuide image for comparison.  They are unrelated to the adult insects you submitted which we will address at a later date.  Knowing the host plant is often a tremendous assistance in the identification of larval stages.  According to the opening sentence of a scholarly article we located on Springer Link:  “
Cerambyx welensii Küster is one of the greatest threats to Quercus suber L. and Quercus ilex L. in Spain.”  While that is not a definitive identification for the Round-Headed Borer you sighted, chances are good that it might be a correct identification.  iNaturalist has an image of the adult.  Your larva has a distinctive yellow coloration.  The Espiritu de Arbol blog has images of adults and larvae.

Dear Daniel,
Thank you very much for your help.
Although presence of Cerambix is common in this area, I had never seen a larvae in such a thin branch, hardly bigger in diameter than the larvae itself.
Best regards
Luis Carlos Jovellar

Subject: Eww…
Location: Philadelphia, Pa
January 3, 2017 6:09 pm
So we recently moved into a new house and after clearing up a drainfly issue, we started finding these guys. At first I thought they were worms but then I found them on the walls and by my sink, too far for most to crawl. They are kinda gross and I am having a hard time figuring out what they are.
Thanks in advance!!
Signature: New homeowner

Probably Beetle Larva

Dear New Homeowner,
Though your image lacks critical detail, in our opinion, this appears to be a Termite, which is consistent with your sighting location on walls and near the sink.  Wood found near plumbing in older homes can often become infested with Termites because of the damp conditions and leaks that might cause wood to rot.  You should probably have a professional investigate for potential infestations.  See images on BugGuide here and here to support our identification.

Cesar Crash Comments.
Hi, Cesar Crash here, I’m using other e-mail.
This guy, I’m quite sure it isn’t a termite.
I suppose it’s a beetle larvae, morfologicaly, it resembles this:
Sorry, I didn’t say, I’m blocked from commenting again, I recieve an anti-spam message.

Thanks for the comment Cesar.  We will check into your inability to submit comments.  There was just some work done on the site and that might have resulted in your problems.  We also thought this might be a beetle larva, but discounted the look of the legs as relating to the poor quality of the image.

Karl also believes this is a Beetle Larva
Hello Daniel and New Homeowner:
You are right Daniel, the image is unfortunately short on detail. However, I am not quite convinced that this is a termite. The antennae seem too short and the cerci on the other end don’t look quite right either. I wonder if this isn’t in fact a beetle larva, perhaps something like a soft winged flower beetle (Melyridae). Both adults and larvae are predators of other arthropods and they do occasionally enter homes. Personally, I would rather find predaceous beetle larvae in my home, than termites. Regards.  Karl