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

Subject: What is this wasplike insect?
Location: Riverbank in Salisbury, south UK
June 25, 2012 9:28 am
About 3/4 inch (20mm) long. Seen flying lazily, with legs dangling, along a riverbank in southern UK. Settled on nettle leaf and commenced cleaning its wings and antennae. Allowed me to get within inches to photograph
Signature: Rich

Sawfly

Hi Rich,
We don’t know.  Normally, we would not have many reservations identifying this as a Wasp, but it might actually be a Bee.  There are several Cuckoo Bees in the UK that look more like wasps than bees.  The best we can do at the moment is to say it is in the order Hymenoptera which included Bees and Wasps as well as Ants and Sawflies.  Searching several UK websites including Garden Life,
Bugs and Weeds and Eakringbirds did not produce anything conclusive.  Perhaps one of our readers will be able to provide some insight.

Daniel,
OK, thanks for the prompt reply. I had a good hunt round before I came to you, I’ll hunt some more and we’ll see how it goes
Best to you
Rich

Eric Eaton provides an identification
Well, this is a very nice image of a sawfly in the family Tenthredinidae (common sawflies), and probably the genus Tenthredo.
Eric

Daniel,
Wow! These experts hardly give one a chance to start looking. Well done Eric and again many thanks
Kind regards
Rich

What's That Bug? does not endorse extermination

Subject: whats this bug?
Location: near forest. asphalt. southern Finland
June 23, 2012 6:58 am
Was going to forest and found this on the ground wondering what the heck is this
Signature: WTB

Sawfly

Hi WTB,
This is a Sawfly in the family Cimbicidae.  These large relatives of bees and wasps do not sting.  We are not familiar with European species, but you can read about the North American relatives on BugGuide.  Here is a page called Trichiosoma with a photo that looks somewhat similar that we found on a link from Mavicanet.  We get very few identification requests from Finland and we are uncertain why that is the case.

What's That Bug? does not endorse extermination

Subject: Big Bee-Horsefly hybrid – What are you?
Location: Boreal Forest, Northern Alberta, Canada
June 19, 2012 9:20 am
I saw this big bug when I was at work in the Boreal Forest in Northern Canada. I have never seen anything like it before. Know what it is?
Signature: Jamie

Elm Sawfly

Hi Jamie,
The Elm Sawfly,
Cimbex americana, is surely an impressive insect.  Though it does not sting, it is related to bees and wasps.  The larvae of the Elm Sawfly feed on leaves and they are frequently mistaken for caterpillars.

What's That Bug? does not endorse extermination

Subject: Large wasp-like insect?
Location: Brandon, Manitoba
June 3, 2012 9:29 pm
Hi there, I’m hoping you can help me. I found this bug, dead on my deck yesterday. I have never seen one before and cannot find anything similar online. I took a few pictures and am really hoping you can identify it for me.
Thank you!
Signature: Jenifer Loades-Suppes

Elm Sawfly

Hi Jenifer,
This impressive insect is an Elm Sawfly,
Cimbex americana, and it is a non-stinging relative of wasps and bees.  The larvae of the Elm Sawfly feeds on leaves and is often mistaken for a caterpillar.

What's That Bug? does not endorse extermination

Subject: Elm Leaf-miner
Location: Fort Collins, CO
May 20, 2012 5:03 pm
There’s more than one species of Elm Leaf-miner, and I can’t discern between them, but this is one of them anyway.
Signature: Lee

Elm Leafminer

Hi Lee,
Thanks for sending your photos.  This is a first for our site and we did a bit of quick research and we believe we have a proper identification for you.  The problem with the common name Leafminer is that it is a name that cuts across many taxonomic orders.  Like Galls which can be caused by Flies, Moths, Mites and Wasps, the same can be said of Leaf Miners.  According to the Colorado State University Extension website:  “Leafminers are insects that have a habit of feeding within leaves or needles, producing tunneling injuries. Several kinds of insects have developed this habit, including larvae of moths (Lepidoptera), beetles (Coleoptera), sawflies (Hymenoptera) and flies (Diptera). Most of these insects feed for their entire larval period within the leaf. Some will also pupate within the leaf mine, while others have larvae that cut their way out when full-grown to pupate in the soil.”  The site goes on to state:  “Sawfly Leafminers. Most sawflies chew on the surface of leaves, but four species found in Colorado develop as leafminers of woody plants. Adults are small, dark-colored, non-stinging wasps that insert eggs into the newly formed leaves. The developing larvae produce large blotch mines in leaves during late spring. The sawfly leafminers produced a single generation each year..  Elm leafminer (Kaliofenusa ulmi) is the most important species, being locally common in several Front Range cities where it develops on American, English and Siberian elms.”  A different scientific name is provided for the species on BugGuide, where it is identified by the abbreviated name Fenusa ulmi.  The University of Illinois Extension Home, Yard & Garden Pest website identifies a weevil that is also called the Elm Leafminer, but we believe your culprit is the Sawfly.  The Elm Flea Weevil is Rhynchaenus alni.

Elm Leafminer

What's That Bug? does not endorse extermination

What am I seeing?
Location: Cornville, AZ
May 14, 2012
Hi Daniel -
Another pic attached for you, strange one.
What am I seeing here?
We have 10 Italian Cypress appx. 25 ft. tall here that we found the
Sawfly Larva on.  Did not want to take a chance on losing them so I
sprayed them all with Spinosad to kill the larva very early this morning.
Went back a few hours later to see if any of the larva were dead, collected
a few twigs in a plastic pail.  Some larva were dead, some still alive.  Shot
some pics and ran across the attached image.
Is this a newly hatched Sawfly of some other type of insect?
Thanks -
Lou Nigro

Sawfly Larva and what might be a Chalcid Wasp

Hi Lou,
We are creating a brand new posting for this image and linking to your original submission.  The other insect looks like a parasitic Hymenopteran, possibly a Chalcid Wasp.  There are some similar looking Chalcids, but they have larger hind legs.  Perhaps it is just the camera angle.  The Chalcid is a Parasitic Hymenoptera.  The female lays eggs within a host, usually the larva of a moth, fly or beetle.  It stands to reason that they might also parasitize Sawfly Larvae.  Most parasitic Hymenopterans are host specific.  It is possible that this Sawfly that is underrepresented on the world wide web has a species specific parasite that preys upon it.  We are going to tag this posting as Food Chain even though much of our response is speculation. 

Eric Eaton identifies the Mining Bee
The “wasp” is a bee in the genus Perdita.  How it got there I have no idea.
Eric

Hi Daniel -
Looks like you are right on, took a few more shots from different angles.
Could be a species specific one as the coloring is a bit different.
Depth of field this close is limited, wish the pic was sharper, will shoot a
few more later.
See attached -
Canon 7D, Tamron 180mm Macro Lens, ISO 100, 1/250 sec, f18 using a Canon flash on
ETTL, manual exposure, handheld.
I’m glad to see that there are wasps in the area, even though I killed some of them,
that are helping me out.  Further spraying will be kept to a minimum.
Wasp measured appx. 2mm in length.
Thanks -
Lou

Hi again Lou,
Since we were wrong about the Wasp and it actually being a Bee, we suspect it was collateral damage from your insecticide.  We are not sure why it was found on the Sawfly.

What's That Bug? does not endorse extermination