Currently viewing the category: "Longhorn Beetles"

This bug was found in Oklahoma…..can you tell me what it is?
Judy Campbell

Hi Judy,
You have Cottonwood Borers, Plectrodera scalator. They are beetles from the long-horned beetle family Cerambycidae. These are very large black and white beetles. We have several photos on our beetle page from last year. Adults are common around cottonwood and poplar trees and the grubs bore into the wood of those trees.

Noticed here in southern New Hampshire (Merrimack) and I have never seen anything like it…. Any ideas?

Totally awesome photograph of a White-spotted Sawyer, Monochamus scutellatus. These large Long-horned Borer Beetles, Family Cerambycidae, are black with a bronze sheen and white markings. The males have extremely long antennae, like your specimen. They attack felled or dead pine trees. Because the larvae make a buzzing sound, they are called “Sawyers”. Though they usually feed on freshly cut logs, they may attack living trees.

Hi I found your site after looking through about 50 websites trying to identify two bugs that I found in my backyard. I’m from Amarillo, Texas if that helps. I have attached pictures of these bugs. I have never in my life seen anything that resembled these two bugs! They are about 3-4 inches long with large antennae. They have pincher like mouths and are hard bodied. They can also fly but I don’t think they can go far because they are so large and heavy. Please help me figure this out because I have a young son and I’m afraid to send him out in the backyard thinking he might get bit by one of these. Thank you so very much for you help in my search!

Dear Lisa,
You have Cottonwood Borers. They are beetles from the long-horned beetle family Cerambycidae. These are very large black and white beetles. We have several photos on our beetle page from last year. Adults are common around cottonwood and poplar trees and the grubs bore into the wood of those trees. They will not harm your children, but a huge infestation may harm your trees.

This is an email forwarded to me by my aunt who found this interesting species of wasp in her backyard…Any ideas???
I know you will think I’m being weirder than usual, but I happen to find all animals (even insects) very fascinating even the freaky ones!!
I was outside this am playing and cleaning up my Danes, then started cleaning the pool. I found this bug dead in one of the baskets. Talk about freaky!!!!!!!!!! Has anyone ever seen this or know what family of insects it is from? Its back-end is striped like a yellow jacket, but its huge!! It measures 3.5 cm from the tip of its tail to its mouth, and it has 2 different sets of wings, the back wings are clear with dark brown veins and are 2.5 cm long, and its front wings are dark brown/red and are 2 cm long but are shaped differently than its back. its long feelers/antennas are almost 3 cm long. and it has HUGE jaws (I think they are called mandibles) but science was a LONG time ago for me. It also appears to have a stinger out its back-end! WOE
~~~~ Debbie”

Hi Rachel and Debbie,
You found a Prionus which is a member of the Long Horned Borer Beetle family. These are among the largest beetles in California as well as other parts of the U.S. The grubs bore into the roots of Oaks, Madrone, Cottonwoods and some Fruit Trees. They will also feed on Eucalyptus. Adults emerge in summer and are often attracted to lights, which might explain its drowned presence in the pool.

Ed. Note: We just recieved this information.
(08/09/2005) identificationsHello – I was recently shown your site, and it is excellent. My specialization is longhorned beetles, and in cruising around I notice a number of incomplete or uncertain IDs for this family. I don’t know if you are interested in receiving this sort of input, but if you are, I offer the following additions to your identifications.
The beetle pictured is Prionus (Neopolyarthron) imbricornis (or much less likely, P. (N.) debilis; that level of detail is lacking in the photo), but with that many antennal segments, cannot be either of the two Californian Prionus (Prionus) species. Cheers.
Frank Hovore

Hello, this bug was found boring through the plaster in my wall last night. What kind of bug is this? It left a hole about .25″ in diameter. I just moved into a newly constructed home in a newly constructed community last week. I live in Modesto CA, which is in the Central Valley and it is an agricultural area. It is possible this bug may not be from this area at all. It may have come along with the building materials the builders used. Can you tell from this picture what type of bug this is and if it is male or female. I am kind of concerned about whether or not this bug could of laid eggs inside my wall. If you need other pictures I will try and take some better ones. This one that I took is through a plastic zip-lock bag that I have the bug in. Also, the white powdery stuff on the bug is probaly the plaster from the wall.
Thanks so much !

Dear Chris,
It looks to me like you have a Pine Sawyer, probably Monochamus titillator. Members of this genus are usually over an inch in length. The first antennal segment has a scarlike area near the tip. The antennae of the males are sometimes twice as long as the body, while females have antennae about as long as the body. Your specimen looks like a female. They feed on evergreens, usually on freshly cut logs but they may sometimes attack living trees. They also bore into felled trees where the female lays eggs. I’m guessing your specimen has been boring in the pine of your home since the tree was cut. You really don’t need to worry about being infested at this point. Sometimes adults may emerge years after the eggs were laid.

I found this beetle(?) on my back patio by my sliding glass door. I am extremely scared of bugs, any type, but I have never seen anything like this before. I live in South Florida (Port Saint Lucie) my backyard has a canal with a lot of trees and bushes. It looks to be around 25 mm in length, it is redish brown with long antennae that curl around and touch the ground. Sorry about my description, I try to stay away and know as little about bugs as possible. The picture may not be great but I was scared to get too close. I have attached it. Let me know if you need a better one and I will try my best.
Thank you, Kim

Hi Kim,
What a beautiful Long Horned Borer you have. The species is Prionus imbricornis. These are large reddish beetles. Your species is a male, identified by his longer, thicker antennae. Larger specimens can reach nearly two inches in body length. The larvae bore in oak, chestnut and other hardwood trees. They also live in roots of herbaceous plants.