Wood hornet?
July 31, 2009
This bug was flying around the lights in front of my house in Richmond, Virginia on the night of July 29, 2009. I think it could be a wood hornet and I think the whip-like tail could be an ovipositor (thanks to the information your website provided!) but I am not sure. If this is an ovipositor, why is it so long? It seemed as though the bug had very little control of it as it flew around the lights and banged into the side of the house!
Steph
Richmond, VA

Female Giant Ichneumon

Hi Steph,
Coincidentally, a few minutes ago we posted an image of a male Megarhyssa atrata, and in that response, we described the female.  Your photo is a female Giant Ichneumon, Megarhyssa atrata.  She does have an ovipositor.  Giant Ichneumons prey upon the larvae of Pigeon Horntails and other wood boring insects that infest dead and dying trees.  The female uses her long ovipositor to deposit eggs deep inside infested wood, “drilling” until she locates the tunnel of a wood boring grub.  That is where she lays the egg. We have several nice images of Giant Ichnuemons ovipositing on our website, including this one from June 2008.  We have heard that Giant Ichneumons may be attracted to artificial lights at night.

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Crane Fly? Damsel Fly? Really Off-Course Fly?
July 31, 2009
Hey there – Here’s a very interesting looking flying insect found yesterday, July 30th, at Massassauga Point Conservation Area, Prince Edward County, Ontario. Very sunny day, humid, temperatures around 28 Celsius. My wife works for the conservation authority and was in the field when she spotted it. I’ve done as much Internet searching as I can but cannot identify the insect. It was in a brushy, wooded area when the photo was taken, and when in flight its legs dangled much like a mud dobber, and it has orange antennae like a wood wasp, but it’s the tail end that has us stumped. It hovered much like a wasp when in flight.
Any help would be appreciated – thanks!
Glenn May-Anderson, Belleville, Ontario
Massassauga Point, Prince Edward County, Ontario

Ichneumon

Hi Glenn,
We receive many identification requests for female Giant Ichneumons in the genus Megarhyssa, but we receive very few images of the males.  This is a male Megarhyssa atrata.  The female has a three inch long ovipositor that is often mistaken for a stinger.  She uses her ovipositor to deposit eggs into dead and dying wood that is infested with wood boring larvae, the food for the larval Ichneumon.

Correction from Eric Eaton
August 4, 2009
Hi, Daniel:
… A couple other things:
The “Giant ichneumon:  male of the species” is incorrect.  The ichneumon in the image is not even in the same subfamily, and it is likely a female.
… Keep up the great job, Daniel:-)
Eric

Update:  Therion morio identified
August 19, 2013
We just received a new photo which we thought might be a male Megarhyssa atrata, but our search for a matching photo led us to this old unidentified Ichneumon.  Searching BugGuide, we discovered it is Therion morio.

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