Black caterpillar with yellow dots on its sides, and blue/white legs. About 4-5cm in length.
Sat, Nov 15, 2008 at 9:32 AM
Hey there!
I was doing some wetland classification earlier this fall (early September), and I happened to stumble upon this little guy in the afternoon. I found him south of Blackwater, in the Beeverton wetland located one and a half hours west of Peterborough Ontario. He was on a tall shrub located along side of an abandoned railway. He’s solid black with yellow spiracles on both of his sides. He also had blue/white abdominal prolegs and solid black thoratic legs. He’s hairless and quite shiny. Hope the picture helps!
Thanks!
Erin G
Thanks!
Beeverton Wetland (Blackwater)
Sawfly Larva
Hi Erin,
We believe this is a Sawfly Larva, and not a caterpillar. We have searched through countless images on Bugguide and could not find an exact match, but we did find one example that was similar. Sawflies are known for striking the pose exhibited in your photograph when they are threatened or otherwise bothered. We will contact Eric Eaton for a second opinion, and also to see if he can give a quick method of distinguishing between caterpillars and sawflies.
Hi Bugman:
This looks like it could be a Willow Sawfly (Nematus ventralis), or a closely related species. More photos at: Link1 and Link2 .
KK
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Posted 16 November 2008
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What kind of larvae is this?
Sun, Nov 2, 2008 at 8:58 AM
A group of larvae were found here in Discovery Park, an urban wilderness located within Seattle, Washington. It was raining outside and they were found on the lid to a trash container yesterday, November 1st. We tried to identify them using our insect books, but most don’t have pictures of larvae. Can you help us? We’d like to know what these little guys become. We have taken pictures of them. One picture shows the legs well and the other gives you the relative size to a finger. Note: The images look more yellow than they did in reality. The larvae are very white/cream colored (not yellow) with the black coloring that you notice in the pictures.
Education staff at Discovery Park
Seattle, WA, USA
Sawfly
Dear Education Staff,
The best we can do on this is to tell you it is a Sawfly Larva. Sawflies are a large group in the order Hymenoptera which contains wasps, bees and ants. Sawfly larvae are often confused with caterpillars. BugGuide has numerous submissions of unidentified Sawfly Larvae to browse through, but without a host plant, exact identification of your specimen may be very difficult. Though adult Sawflies resemble bees or wasps, they do not sting.
Big nasty wasp
Thu, Nov 6, 2008 at 3:29 PM
Hi Bugman!
This is a giant crazy wasp that I found in a mist net while banding birds. It was in some coastal scrub habitat in Marin County, California on November 5, 2008. I have no idea what kind of wasp it is.
Walker Pett
Marin County, CA
Wood Wasp
Hi Walker,
This is a Wood Wasp or Horntail, and despite its “nasty” appearance, it is perfectly harmless and cannot sting. We believe this is Urocerus californicus based on images posted to BugGuide.
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Posted 08 November 2008
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Giant winged earwig, maybe?
Since I’ve moved into my house about 5 years ago, every year there has been one or two of there vicious looking bugs on a half dead tree in the middle of my driveway from late spring to late fall. Same looking bug, near the bottom of the tree. The tree is 80% dead, with all the leaves being at the very top.
I never see it eat or fly around. I just sits on the tree and…pulsates. That’s about the best way to describe it. It doesn’t mind the lawnmower. Only ever seen it on the tree. It’s about 4 or 5cm long. I don’t see any holes that it’s living in.
At first I thought it was some sort of wasp because of the way it’s colored, but the more I looked at it, it reminded me of an earwig. One of my friends said, “That’s what wasps looked like when I was young.” Of course, I have the bug identification skills of a cinder block, so that’s why I thought I’d send it to you.
Thanks for any help, it’d be nice to finally put a name to whatever that is.
Thanks
Northwest Ohio
Pigeon Horntail
Your insect is a Pigeon Horntail, a type of Wood Wasp. This non-stinging species lays eggs in dying and dead trees and the larvae bore into the wood.
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Posted 29 September 2008
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Caterpillar ID please!
Hello Bugman.
Would love it if you could help me id this beauty. I found her in the garden in Chelsea, QC. Isn’t she stunning?
Thanks for your help!
Celine
Québec, Canada
Much appreciated
Introduced Pine Sawfly
Hi Celine,
This isn’t a caterpillar. It is a Sawfly Larva, a relative of wasps. We believe it is the Introduced Pine Sawfly, Diprion similis. According to BugGuide, the species was “First recorded in Canada in 1931 near Oakville, Ontario, and has not spread naturally much beyond there. There were light infestations in other parts of Ontario in the 1970s and one in southern Quebec in 1940. “
is this an ichneumon perhap
My grandson and I found this on a Tamarack tree in the backyard of our home here in southwestern Quebec. He appears to be depositing something in the tree. We would really appreciate your opinion. Thanks
Rory and Billy
Hi Rory and Billy,
This is a Horntail or Wood Wasp. We believe it is Urocerus albicornis according to images posted to BugGuide. The larvae of Horntails are wood boring and they are the primary hosts for the parasitic Giant Ichneumons in the genus Megarhyssa. Your photo is truly stunning.
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Posted 29 August 2008
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Caterpillar @ Presque Isle River
Seen: Presque Isle River in MI’s U.P. I did not see this on your site.
You couldn’t locate this “caterpillar” because it is not a caterpillar. It is an Elm Sawfly Larva, Cimbex americana, which can be found on Bugguide.
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Posted 28 August 2008
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Need to know what this is
Photo taken in woods in northern Indiana. August 27, 2008 One inch or a little smaller in length. About ten on one plant. Don’t know what the plant is. Thanks Much,
John Hicks
Hi John,
Though it resembles a caterpillar, this is actually a Sawfly Larva known as a Butternut Woolly Worm, Eriocampa juglandis. According to BugGuide, they: “feed on leaves of Black Walnut (Juglans nigra) and Butternut (Juglans cinerea). Also reported on Carya spp. (Hickory).”
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Posted 27 August 2008
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Caterpillar(?) on elm
I love your site. It’s helped me ID a number of crawly friends around my yard. But now I’ve got one I can’t ID. I live in Northborough, MA and I found these chewing away on a sprouted stump in my yard which I think is some sort of elm; it’s got a lot of greenery, but none over about 6ft up. Most of them are feeding all together on one or two hand-sized leaves at a time, and they’re eating the entire leaf except the central supporting vein, and even some of that too, before moving on to the next. The prolegs appear to almost be vestigial; I saw one of them relocating and it curled its abdomen around the twig more like a monkey’s tail to creep forward on it’s front legs. Can you help me ID them? Thanks!
Karen
Hi Karen,
We are nearly certain these are Elm Argid Sawflies, Arge scapularis, as pictured on BugGuide. At the very least, they are probably in the genus Arge. The larvae of many species look very similar.
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Posted 15 August 2008
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Massive damage in Connecticut!!
Hello from Connecticut,
I was out in the garden today and noticed that our dogwood shrub was totally without leaves. A few left over ones were mostly chewed. This poor bush suffered from a drought last year and has now been stripped naked! The culprits were piled all over the last remaining leaves. So now the question is, do I dump them into a bucket of soapy water or are they good for the environment? They were here last year too. I hate to kill anything, but have a number of shrubs they could continue to eat. Thanks so much for your advise!
Tricia
Hi Tricia,
We do not give extermination advice. These are Dogwood Sawfly Larvae in the genus Macremphytus.
Update: 908/16/2008)
Thanks for the information Daniel,
They’ve hit the next dogwood bush as well. Our property is a certified wildlife habitat, so extermination is not my choice by any means. Unfortunately, when one species gets out of control, sometimes I need to step in to back it off some. We only use organic methods for everything so we do as little harm as possible. It’s absolutely amazing how many bees, butterflies and hummingbirds we have around the yard! Again, thanks for the help. We know most birds and plants, but now are working on getting to know the insect population.
Tricia
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Posted 15 August 2008
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Is this an Ichneumon?
I was taking some pics of some Giant Ichneumons ovipositing in a tree and this one was there too. Actually there were 2 of these on the same tree with about 3 Giant Ichneumons. It was just sitting there, but it’s the same size as a Giant Ichneumon but the "butt" is fatter than the others and the ovipositor a whole lot shorter, about a 1/4" long. Thanks!
Francine
Hi Francine,
This is a Pigeon Horntail, Tremex columba, a type of Wood Wasp. This female is depositing eggs that will hatch into wood boring larvae. It is relevant that you found the Pigeon Horntail depositing eggs on the same tree as a Giant Ichneumon because the Megarhyssa species are parasitic on wood boring larva. We found a Colorado State University web page with good information on both species that indicates the Giant Ichneumon is the most common natural enemy of the Pigeon Horntail. The page author, W. Cranshaw, writes of Megarhyssa macrurus: “The adult female can be seen searching the same areas used by the pigeon tremex, although they tend to be present a bit later in the summer. Developing horntail larvae can be detected under the bark by the female and she subsequently drills into the wood to the tunnel of the horntail larva. During egg laying (oviposition) the host larva is paralyzed with a sting after which the egg is laid. The parasitic wasp larva feeds on the paralyzed horntail larva, consuming it completely within a couple of weeks. It then pupates and remains dormant under the bark until the following summer, when the adults emerge. “
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Posted 14 August 2008
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New London, NH USA
Can you tell me what these caterpillars are? I think one is a swallowtail but don’t know the other one. Thank You
Your non-caterpillar is a Cimbex Sawfly Larva.
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Posted 09 August 2008
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