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My garden is full of buddleia and therefore full of butterflys
I know monarch butterflies..and no other kind so want to learn to identify
I don't think this is Rhogogaster, there's too much black on the head and thorax. I think it must be in genus Tenthredo, which contains a few black and green species.
Entomologist and biological recorder
I am 'running' through all the posts of Rhogogaster viridis (I may have one). I can see this one isn't but I (we) need some slightly more definitive advice about how differentiate. Is there a websource?
The FSC key splits Rhogogaster on the basis of its eyes - if you look at it head-on the eyes in Rhogogaster do not converge, whereas in the green Tenthredo species the eyes do converge towards the bottom. But that's not east to see in most photos. FSC key:
Usually the green Tenthredo have substantially more black on top of the head, thorax and abdomen, forming solid blocks of black. Rhogogaster does have some black as well, but it is usually more broken up into lines and spots.
Typical Rhogogaster - top of head is more green than black:
Typical green Tenthredo - top of head is more black than green:
However, the colours do vary and it isn't always possible to be certain.
That is all very useful - thanks.
What I have is not a Tenthrido of the type above but Rhogogaster as in http://www.ispotnature.org/node/308051 with VERY similar upper thorax pattern (subdued black).
Not like http://www.ispotnature.org/node/241801 strong black.
Here it is -
Lat/Lng: 51.4, -2.6
OS grid ref: ST5970