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Although the Grey and Dark Dagger are very similar in the flight stage they are quite different in the caterpillar stage. I believe you are correct with Grey Dagger and you should enter an ID as such. At present you have an ID (Latin names) of Grey / Dark Dagger.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Thanks for your comments Chris. I think it is my inexperience with iSpot that is also at fault. I thought it was Acronicta psi but when I entered the ID I incorrectly allowed Acronicta psi/ tridens to be selected. I will try to change.
Further to Chris above moth cannot be readily distinguished as an adult from Grey Dagger (Acronicta psi) except by examination of the genitalia, CATERPILlARS are not a problem as the species are quite different.
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