Field parasitism of two lady beetles, a recently introduced species, Harmonia axyridis Pallas, and an indigenous species, Coleomegilla maculata lengi Timberlake, by Dinocampus coccinellae Schrank (Hymenoptera: Braconidae) was investigated in southwestern Quebec. Adult coccinellids were sampled from June to September 2001 in alfalfa and corn fields. Parasitism rates were recorded by dissection and rearing of coccinellids in controlled condition. The average proportions of coccinellids with a parasitoid larva were 4.6% for H. axyridis and 32% for C. maculata but 0% of the H. axyridis and 5.9% of the C. maculata were successfully parasitized. In July, more C. maculata than H. axyridis were found to be parasitized and among all individuals dissected, C. maculata were more frequently found superparasitized than H. axyridis. Our results suggest that D. coccinellae is not well adapted to H. axyridis in Quebec. This is the first mention of H. axyridis being attacked by D. coccinellae in Canada. Coleomegilla maculata lengi (Coccinellidae) : Host Harmonia axyridis (Coccinellidae) : Host Dinocampus coccinellae (Braconidae) : Parasite Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Land zones; Nearctic region; North America; Canada Coleomegilla maculata lengi; Hymenopteran parasites; Parasitism rate; Dinocampus coccinellae; Quebec; Monteregie Dinocampus coccinellae; Coleopteran hosts; Parasitism rate including new host record for 1 species; Coleomegilla & Harmonia; Quebec; Monteregie Harmonia axyridis; Hymenopteran parasites; New host record; parasitism rate; Dinocampus coccinellae; Quebec; Monteregie none