none COCCINELLIDAE-; HYMENOPTERAN-PARASITES; Dinocampus coccinellae; Host acceptance behaviour of parasite Dinocampus coccinellae; COLEOPTERAN-HOSTS; Coccinellidae; Host acceptance behaviour of parasite. Dinocampus coccinellae (Schrank) spent > 80% of a 300-s observation period in host-handling activities (orienting toward, pursuing, and attacking hosts) when exposed to individual adult Coleomegilla maculata (DeGeer) or Coccinella septempunctata (L.). When D. coccinellae was exposed to two populations of Hippodamia variegata (Goeze) from Canada or France and Propylea quatuordecimpunctata (L.) from Canada or Turkey, host-handling activities decreased to < 70% of 300 s. D. coccinellae oriented toward and attacked C. maculata and C. septempunctata in 10-12 s, compared with 18-38 s for H. variegata and P. quatuordecimpunctata . Additionally, C. maculata and C. septempunctata were attacked more frequently (mean = 3.3 and 2.6 in 300 s, respectively) than H. variegata or P. quatuordecimpunctata (mean = 2 and 1.5 in 300 s, respectively).