[Microsporidian Vairimorpha hybomitrae (=Nosema hybomitrae) in gadflies of the genus Hybomitra in Karelia].

A brief description of the species Vairimorpha hybomitrae which earlier was described as Nosema hybomitrae is given. It has two types of sporogony: one--with single thick--walled spores 4.8 +/- 0.13 X 3.63 +/- 0.02 in size, the other--with thin-walled mononuclear oval octospores 2.0-2.4 X 1.5-1.8 enveloped by a pansporoblastic membrane. The species was found in larvae of gadflies of the genus Hybomitra collected in Karelia.