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Hello, can someone tell me please the differences between the two, I'm assuming they are hard to tell apart or is it just location that divides them.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
I went to the trouble of looking up the distribution of trifolii in Hants and discovered it is not recorded from where this moth was observed.
The NBN maps have both species in the area, so location is of no help. They are notoriously difficult to separate and even genitalia dissection is not certain, apparently. Consideration of an individual specimen is probably not going to arrive at an ID, then. Larvae and cocoons can help to differentiate them.
"British and Irish moths:an illustrated guide to selected difficult species" by Townsend, Clifton and Goodey is a useful guide.
My Flickr photos...
I think the distribution maps can be a bit misleading, particularly as there has long been confusion between these 2 species. The UK moths website has very different distribution maps. In the Bristol area virtually all individuals are generally assumed to be Z.lonicerae and Z.trifolii is only known from 1 or 2 localities and records are mainly historical (and old records from long-lost sites still show up on NBN maps!).
Lat/Lng: 51.1, -1.2
OS grid ref: SU5642