A preliminary list of the fruit flies of the genus Anastrepha (Diptera: Tephritidae) in Costa Rica.
The distribution of 28 species of Anastrepha known to occur in Costa Rica and their host plants are given. The results were based on field studies carried out in 1985-86. Of the species, 10 are recorded for the first time in Costa Rica. The differences in morphology and host preferences between Costa Rican and Mexican-Guatemalan populations of A. ludens are also discussed.