The new data on distribution in Poland and hosts of Charletonia singularis (Oudemans), Leptus phalangii (De Geer) and L. mariae Haitlinger larvae are given. Ch. Singularis was collected from the new localities without hosts, L. phalangii was collected from the new localities on Mitopus morio (Fabr.) and Oligolophus tridens (C. L. Koch) (Opilionida), and L. Mariae was collected from the new locality on Phyllobius urticae (De Geer) (Coleoptera). O. tridens and Ph. urticae are recognized as the hosts of Erythraeidae larvae for the first time.