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In Veracruz State, Mexico, the temporal and spatial distributions of 5 species of parasitic Hymenoptera attacking larvae of 5 Anastrepha species in 7 species of fruit tree canopies were examined. Parasitism by Doryctobracon areolatus (Szepligeti) (Braconidae), Diachasmimorpha longicaudata (Ashmead) (Braconidae), and Utetes anastrephae (Viereck) (Braconidae) was higher in 3 of 4 significant cases in the lower portions of the canopies. U. anastrephae was more abundant in the interior of canopies (2 cases), whereas D. areolatus was more common in the margins (1 case). In 6 of 7 instances the mean sizes of fruits containing parasitoids were smaller than those of infested fruits without parasitoids. U. anastrephae attacked larvae in a narrow range of smaller host-fruit species relative to other parasitoids. The efficiency (proportion of larvae attacked in a fruit) of D. longicaudata compared to that of other …