This work reports the first occurrence of Zaeucoila incompleta (Kieffer) as a parasitóid of Diptera in Brazil. Weekly samples were taken with water traps, five placed at the pastures and five in the nearby native vegetation. These traps were made of yellow buckets measuring 30 cm in diameter and filled with 2l of trap water, 2 ml of detergent and 2 ml of formaldehyde. During the year 1998 thirty five examples of Z. incompleta were collected in April, June and July. These data contribute to the knowledge of parasitoids fauna in Brazil.
Insecta; Cynipoidea; pasture; water traps