[Parasitism of gordiids in the larvae of Tabanus autumnalis L. horseflies].

For the first time data are given on the infection of larvae of gad flies with two species of Gordius sp. The infection intensity of larvae collected near water bodies at the low reaches of the Desna river was from 20 to 66.7%. The data obtained on the intra-cavity developmental period of Nematomorpha as well as on the infection intensity are of great interest due to unsufficient information on this phenomenon.