Hello Piet,

According to this web-answer i will answer in English,around the Mosel/nancy area should be plenty of places for both L.viridis/bili,Asp viper,local and Viridisflavus,too, Longissimus probably, although it is more common in the Southern parts of the central distribution .. According to French reports and publications i have read,the H. viridiflavus is already present in the Ardennes,and Luxemburg en most Northern parts of France,in the neighbouring South-eastern place Muno,which i visited with a group,Viridiflavus is seen,and even Asp viper,although very rare, both its proven since 2000 studies, that this species has already crossed the Belgian/Luxembourg borders .Many people dont know this ,but french studies show that viridiflavus has moved over 60 km ! to the North since the 1970's ..The first reports from the species in Lux. dating even earlier.. So this animal must be able to find in the Nancy region because it is more common there ... hope i've been able to help out a little..
regards ,

Marc