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Thanks to Joris Menten, I found following paper:
"DeJong, H. (1985). Norellia spinipes (Meigen) in the Netherlands and its distinction from N. tipularia (Fabricius) Diptera: Scathophagidae). Entomologische Berichten 45; 21-23."

this paper gives somes differences between the 2 species + drawings of the genitalia. I have to take a look at the specimen i collected but it seems like N. spinipes is typical for the hostplant Narcissus and N. tipularia (with a more southern distribution) to Leucojum. Pupae of N. tipularia has been found in the Netherlands in bulbs of Leucojum originating from Hungary.
I will check the specimen as soon as possible and then i probably can remove the "cf" out of the title :)

grtz
pieter