EN
Interactions between swarming Chironomidae and insectivorous Ceratopogonidae were observed in the field. Chironomid males of the genera Natarsia FlTTKAU, Polypedilum KlEFFER, Parachironomus LENZ, Cladotanytarsus KlEFFER, Paratanytarsus THIENEMANN et BAUSE and Tanytarsus WULP were attacked by females of Sphaeromias CURTIS, Probezzia KlEFFER, Palpomyia Meigen and Nilobezzia KlEFFER. Detailed description of egg laying in Probezzia seminigra (PANZER) is given. The genus Nilobezzia (Ceratopogonidae) and Tanytarsus verralli GOETGHEBUER (Chironomidae) are recorded in Poland for the first time.