Differences in Egg‐biology and Habitat Binding betweenProsimulium tomosvaryi(Prosimuliini) and Simuliini (Diptera, Simuliidae)Oviposition of the mountain black flyProsimulium tomosvaryi(Enderlein, 1921) (tribe Prosimuliini) takes place in May in the „Niederbergisch‐Märkisches Hügelland”︁ (North Rhine‐Westphalia). The eggs aestivate until late November. They differ in morphology, egg‐layers and germ band‐formation from tribe Simuliini. The development is negatively correlated with temperature: the embryo develops slowly, but without a pause at low temperatures (12°C) prevent development (temperature controlled dormancy). It is explained that distribution ofProsimuliumspecies in Central Europe is limited by the potency of the te