EN
In Galleria mellonella larvae infected with insect-parasitic rhabditoid nematodes, S. feltiae and H. bacteriophora both the spectrum of haemolymph proteins and their concentration were greatly reduced. These changes occurred especially during the infection of H. bacteriophora. The total disappearance of the immune proteins of the lysozyme and cecropin-like polypeptides in Galleria haemolymph indicates unequivocally that entomogenous nematodes selectively destroy the humoral immune mechanism of the insect.