none Areopraon lepelleyi (Braconidae); Hymenopteran parasites; Dendrocerus ulmicola; Hyperparasitism in Eriosoma ulmi (Hemiptera); Hyperparasitism; Of Eriosoma ulmi (Hemiptera); By Dendrocerus ulmicola; Czechoslovakia Calaphidius elegans (Braconidae); Hymenopteran parasites; Dendrocerus paradoxus; Hyperparasitism in Hamamelistes betulinus (Hemiptera); Hyperparasitism; Of Hamamelistes betulinus (Hemiptera); By Dendrocerus paradoxus; Sweden Dendrocerus paradoxus (Megaspilidae); Hymenopteran hosts; Calaphidius elegans, hyperparasitc in Hamamelistes betulinus (Hemiptera); Sweden; Pitea; New species, hyperparasitic with Calaphidius elegans in hemipteran host Dendrocerus ulmicola (Megaspilidae); Hymenopteran hosts; Areopraon lepelleyi, hyperparasitism in Eriosoma ulmi (Hemiptera); Czechoslovakia; Prague; New species, hyperparasitic with Areopraon lepelleyi in hemipteran host Eriosoma ulmi (Aphidoidea); Hymenopteran parasites; Areopraon lepelleyi; With hyperparasite Dendrocerus ulmicola; Hyperparasitism; By Dendrocerus ulmicola in Areopraon (Hymenoptera); Czechoslovakia; Prague; Hymenopteran parasites with hyperparasites Hamamelistes betulinus (Aphidoidea); Hymenopteran parasites; Calaphidius elegans; With hyperparasite Dendrocerus paradoxus; Hyperparasitism; By Dendrocerus paradoxus in Calaphidius elegans (Hymenoptera); Sweden; Pitea; Hymenopteran parasites with hyperparasites Dendrocerus paradoxus (Megaspilidae); Sp nov; Sweden, host Calaphidius elegans; P. 198, fig'd Dendrocerus ulmicola (Megaspilidae); Sp nov; Czechoslovakia, host Areopraon lepelleyi; P. 203, fig'd