Currently viewing the category: "Horntails, Wood Wasps and Sawflies"
What's That Bug? does not endorse extermination

Subject:  Cicada wasp?
Geographic location of the bug:  Hoquiam Washington
Date: 07/21/2019
Time: 10:22 AM EDT
Your letter to the bugman:  This wasp like insect was on my chair. In the forest of Hoquiam Washington. July 19, 2019.
I did not see a stinger, it moved slowly, did not try to fly away. it was approx 1.5 inches long.
How you want your letter signed:  Veronica

Elm Sawfly

Dear Veronica.
This is not a Western Cicada Killer.  It is a non-stinging Elm Sawfly.

Thank you Daniel. We dont have Elm trees here though!

Hi again Veronica,
According to BugGuide:  “hosts include elm (
Ulmus), maple (Acer), birch (Betula), willow (Salix), and basswood (Tilia); adults girdle bark on twigs.”  Additionally, lists of host plants are often incomplete and many species adapt to different host plants due to garden cultivation and species range expansion.

What's That Bug? does not endorse extermination

Subject:  Striped Wasp-like bug & a fly/bee type bug
Geographic location of the bug:  Black Mtn Fire Lookout, SW Wyoming, USA
Date: 07/13/2019
Time: 01:23 PM EDT
Your letter to the bugman:  Please identify this wasp and fly-type bug. Hanging out at my Fire lookout.
How you want your letter signed:  Roger Lockwood

Wood Wasp

Dear Roger,
We will take your identification requests one at a time to give each insect its just due.  The wasp is a type of Horntail in the genus
Uroceros, most likely Urocerus flavicornis which is pictured on BugGuide.  We tried to determine the preferred host trees for this Wood Wasp, but we had to zoom out to the subfamily level on BugGuide to learn they feed “on conifers.”  We wanted more details to complete this posting, so we continued to research.  According to the US Forest Service, where the BugGuide provided taxonomic name is actually a subspecies Urocerus gigas flavicornis, they feed on “Fir, larch, spruce, pine, and Douglas-fir.”

What's That Bug? does not endorse extermination

Subject:  Is this a bee?
Geographic location of the bug:  CH43 9AJ
Date: 07/13/2019
Time: 03:28 PM EDT
Your letter to the bugman:  What is this? Is it a bee?
How you want your letter signed:  ??

Honeysuckle Sawfly

Dear ??,
We had no idea where CH43 9AJ is located, but a web search produced:  “
CH43 9AJ. Postal code in Birkenhead, England.”  This is a Sawfly, a non-stinging relative of Bees and Wasps.  Based on an image on NatureSpot, we are quite confident it is Zaraea fasciata, and the site states:  “Uncommon with most British records coming from England and Wales.”  According to UK Wildlife, it is commonly called the Honeysuckle Sawfly.

Honeysuckle Sawfly

What's That Bug? does not endorse extermination

Subject:  mystery hoverfly
Geographic location of the bug:  Mt St Helens, Washington, USA
Date: 07/11/2019
Time: 08:08 PM EDT
Your letter to the bugman:  Seen June 30, 2019. It’s with body was slightly over an inch (2.5-3 cm) long. Seen at Coldwater Lake, Mt St Helens National Volcanic Monument. A friend thought it might be a species of Tachinid Fly. I would be interested to know if anyone recognizes it.
How you want your letter signed:  Linda Severson

Sawfly: Trichiosoma triangulum

Dear Linda,
This is not a Hover Fly nor any other True Fly.  Flies have a single pair of wings and your insect has two pairs of wings.  The clubbed antennae characterizes it as a Sawfly, a non-stinging relative of stinging Bees and Wasps.  We believe we have identified it as
Trichiosoma triangulum thanks to images on BugGuide.  According to BugGuide:  “Larvae feed on leaves of alders (Alnus), ash (Fraxinus), poplars (Populus), willows (Salix), cherries (Prunus).”

What's That Bug? does not endorse extermination

Subject:  Caterpillar identification request
Geographic location of the bug:  Redmond, WA
Date: 06/28/2019
Time: 06:00 PM EDT
Your letter to the bugman:  Found this on a local street.Any idea what type of caterpillar this is? Thanks!
How you want your letter signed:  Don

Elm Sawfly larva

Dear Don,
Though it resembles a Caterpillar, the Elm Sawfly larva,
Cimbex americana, is actually a member of the insect order that includes Wasps and Bees.

Thank you so much! Really appreciate your knowledge!

What's That Bug? does not endorse extermination

Subject:  I am trying to care for this little friend and I have no idea what he is..
Geographic location of the bug:  New Hampshire
Date: 06/07/2019
Time: 08:25 PM EDT
Your letter to the bugman:  I thought he was an inchworm but.. when I Google ‘inchworm’, I cant find any like him. Please help, it would be super appreciated!!
How you want your letter signed:  Not sure what this means.. whichever way you’d like, I guess

Sawfly Larva

This is NOT an Inchworm, nor is it another species of Caterpillar.  This is the larva of a Sawfly, a non-stinging relative of Bees and Wasps.  It closely resembles the Roseslug, Endelomyia aethiops, pictured on Ecological Landscape Alliance where it states:  “During the months of May and June in the Northeast you may have noticed leaf discoloration in the form of blotches on your rose leaves (Figure 1). If you inspect the leaves closely you will see the culprit! It is a small, narrow bodied larva called the roseslug sawfly, an introduced pest from Europe. The larvae have pale green colored bodies and light tan-orange colored heads.”  Here is a BugGuide image.  The best way to care for this Sawfly larva is to feed it leaves from the plant upon which it was found.

Sawfly Larva

What's That Bug? does not endorse extermination