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Thanks a lot, Steve! As I feared the external characters aren't much of anything in this group.

Guess I must check the literature you mentioned next.

So I perhaps should get hold of the Tanasijtshuk's 1986 paper if it contains more species than "Bei-Bienko"?

But what is the reference of that Raspi you mentioned? Sounds Italian... Does that article contain Northern European species?

I'll include the preliminary and unchecked list of Finnish Leucopis species:

Leucopis alticeps (Czerny)
annulipes (Zetterstedt)
argenticollis (Zetterstedt)
geniculata (Zetterstedt)
griseola (Fallén)
impunctata (v. Roeser)
puncticornis (Meigen)
Leucopomyia silesiaca (Egger)
Lipoleucopis praecox (de Meijere)
Neoleucopis atratula (Ratzeburg)
freyi (McAlpine)
obscura (Haliday)
orbiseta (McAlpine)