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

Subject: Bug Indentity
Location: Wichita, Ks
January 24, 2017 4:05 am
I found this in washer. My roommate has been issues with bugs. I just wondered what this was because I’ve never seen one before. Thanks!
Signature: Cherie

Bombardier Beetle

Hi Cherie,
This fascinating beetle is a Bombardier Beetle in the genus Brachinus. and according to BugGuide:  “Adults have chemical defenses, ejecting toxic, foul-smelling gases from their abdomen with a loud popping sound. The explosive brew is composed of hydrogen peroxide, hydroquinone, and catalytic enzymes.”

Bombardier Beetle

What's That Bug? does not endorse extermination

Subject: Carabus granulatus?
Location: Lat. 48.372 Long. 123.538
December 8, 2016 7:29 pm
Dear Bugman,
Once again, I have thoroughly enjoyed exploring your site. Thank you and your crew for the wonderful time I just had!!
I found this beetle overwintering under an abandoned wasp nest attached to a rafter in my potting shed. I didn’t mean to disturb it and it was pretty groggy being woken up. it’s about 3/4″ long excluding the antennae.
I thought it was some sort of long-horn so I spent quite a while looking at them.
Anyway if it is an introduced insect, is it a problem? If it likes to eat earthworms that’s fine, we have lots!
Thanks again!
Best regards,
Signature: Sue

Ground Beetle

Ground Beetle

Dear Sue,
If we have calculated your global coordinates correctly, you found this Ground Beetle on Vancouver Island.  Please confirm.  We believe you are correct that this is a Granulated Carabid, and we do not believe it poses a threat to any local species despite it being an Old World species.

Hi Daniel,
Thank you so much for your reply!
Yes you are correct. The location is southern Vancouver Island, Metchosin specifically, William Head Road.
Thank you also, for letting me know it is not a threat to the local ecosystem. I do really enjoy discovering insects and learning about them.
Haha! I’m not a great fan of the flea beetle though. They all like my brassica way too much!
I was pretty amazed when I saw this one. I think it’s a Rhyssa persuasoria. Holy cow!! Some bug!!! Not a very good picture though.
Cheers, Sue

What's That Bug? does not endorse extermination

Subject: Insect Identification
Location: Oklahoma, USA
September 24, 2016 11:51 pm
My son has these in his garden. What are they?
Signature: BPWO

Larva of a Caterpillar Hunter

Larva of a Caterpillar Hunter

Dear BPWO,
This is the larva of a Caterpillar Hunter, a Ground Beetle in the genus
Calosoma.  Many times immature insects have a different diet than the adults, but not so with the Caterpillar Hunters.  Both larvae and adults ravenously feed on Caterpillars.

What's That Bug? does not endorse extermination

Subject: Nice Black Beetle
Location: Anchorage, Alaska
August 26, 2016 5:29 pm
I’ve lived in Alaska for 2 years and I’m not well acquainted with the insects here. I caught this guy ambling around in my garage. I took a photo and set it outside. What kind of beetle is this?
Signature: Sara

Ground Beetle

Ground Beetle

Dear Sara,
This is a beneficial, predatory Ground Beetle in the family Carabidae.  There are many similar looking species found in Alaska on the Carabidae of the World site, and we are not certain of your species.

Update:  November 5, 2016
We just received a comment that this is in the genus
Pterostichus, and we have linked to the genus on BugGuide.

What's That Bug? does not endorse extermination

Subject: Afghan Beetle
Location: Bagram, Afghanistan
August 23, 2016 4:06 pm
Hey. I wondered if you could tell me what this bug was that I caught crawling past my feet in the office when I had no shoes on! I’m sure he means no harm but didn’t want any nasty surprises crawling up my leg so I caught him anyway. I’ve let him go outside now though but still wondering what he was as he looks quite cool!
Signature: Dean, AFG

Ground Beetle: Pheropsophus catoirei

Bombardier Beetle: Pheropsophus catoirei

Dear Dean,
Your pretty beetle is a Ground Beetle in the family Carabidae, and we believe we have correctly identified it as
Pheropsophus catoirei, a member of the subfamily Brachininae according to the Carabidae of the World site.  According to BugGuide, Brachininae is the subfamily that includes Bombardier Beetles, a group that have chemical defenses explained on BugGuide as:  “Adults have chemical defenses, ejecting toxic, foul-smelling gases from their abdomen with a loud popping sound. The explosive brew is composed of hydrogen peroxide, hydroquinone, and catalytic enzymes.”  A very similar looking beetle is pictured on RevolvY where it states:  “Bombardier beetles are ground beetles (Carabidae) in the tribes Brachinini, Paussini, Ozaenini, or Metriini—more than 500 species altogether—which are most notable for the defense mechanism that gives them their name: when disturbed, they eject a hot noxious chemical spray from the tip of their abdomen with a popping sound.  The spray is produced from a reaction between two chemical compounds, hydroquinone and hydrogen peroxide, which are stored in two reservoirs in the beetle’s abdomen. When the aqueous solution of hydroquinones and hydrogen peroxide reaches the vestibule, catalysts facilitate the decomposition of the hydrogen peroxide and the oxidation of the hydroquinone.[1] Heat from the reaction brings the mixture to near the boiling point of water and produces gas that drives the ejection. The damage caused can be fatal to attacking insects. Some bombardier beetles can direct the spray over a wide range of directions.”

What's That Bug? does not endorse extermination

Subject: What is this bug
Location: Monkton MD
August 9, 2016 5:31 pm
Help. Our neighborhood cannot figure out what this bug is
Signature: Curious

Beetle Larva we presume

Beetle Larva we presume

Dear Curious,
Your somewhat blurry image reminds us of the classic photo of Nessie.  Our best guess on this is that it is some beetle larva, possibly a Ground Beetle larva as it looks rather similar to a Caterpillar Hunter larva.

What's That Bug? does not endorse extermination