On the Diptera of the Amber-fauna. 311 
prevalence in the same degree; at the same time, the presence of 
a number of Diptera, closely related to some southern species, 
will gain so much the greater importance, since the rarity of 
eir occurrence in amber merely proves their rarity in the spe- 
cified local conditions, without excluding the possibility of their 
common occurrence in other localities as well as of the occur- 
that of the southern peninsule of Kurope. 
An especial interest is afforded by the comparison of the Am- 
and careful scrutiny only the fossil Diptera found near Radoboj 
in Croatia. The collection of these Diptera belonging to the 
