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Its very like a large mature Red Sword-grass larva but the only thing that doesnt seem right is the lack of a black trim to the upper edge of the white lateral stripe.
I just uploaded another photo which shows tiny bits of black on the head end, nowhere near the black strip it should have if it is a Red Sword-grass larva. Also our garden, though it has lots of plants, is quite dry and open on the whole, not the woody damp habitat the adult prefers.
I will have a good look now, yeah it might be something else altogether. I wouldnt be too shocked if you got one in the garden though, they like a wide range of habitats and a very wide range of plants. Ive only ever seen them on moorland myself, got one on Wednesday.
Must admit though there are many cats which have this colour scheme with subtle differences, a really big one always makes me question RSG, the larva can be substantial when mature- in my hunting patch this is during August.
Hi again Phil,
Yes I did notice as mentioned above that the black trim was very little. Various other things are right for RSG and it is possible that this is an example of little black trim.
The red dots on the flanks are in perfect position.
Having said all of the above, there might be another similar sized green larva with red side spots and pale stripe with typically less black edge than would be expected on RSG, I just havent encountered it myself yet so RSG is my best guess.
Please let me know if you discover it is another species!!! I'd love to know what it is, cheers.
Lat/Lng: 51.5, -2.5
OS grid ref: ST6781