Technical Abstract: Twenty fruit species representing 12 families were collected from various locations in western Puerto Rico and monitored for the emergence of Anastrepha spp. pupae. We collected 14,154 tephritid pupae from 16 fruit species representing 10 families. The relative infestations of these fruits (pupae/kg of fruit) were recorded. Observed host ranges were compared with the host ranges reported in the literature. Forty six specimens of the braconid parasitoid Utetes anastrephae (Viereck) were recovered from pupae collected from Mangifera indica (L.), Spondias mombin (L.), Psidium guajava L., Chrysobalanus icacos L., Terminalia catappa L., and Garcinia intermedia (Pittier) Hammel. Fruit yielding U. anastrephae were collected from the western north coast (Isabela and Hatillo), the west coast (Mayaguez and Añasco), and the mountainous center of the island (Corozal and Adjuntas). We collected one specimen of the parasitoid Doryctobracon aerolatus (Szepligeti) from the west coast (Añasco), which had not been previously reported in Puerto Rico. This study reveals idiosyncratic host usage by A. obliqua (Macquart) and A. suspensa (Loew) in Puerto Rico relative to other regions where these species occur. This host-usage pattern should give pause to regulators of fruit importation and exportation that base their decisions on literature from regions other than those of immediate interest to them. We present a preliminary phenology of what are probably the primary fruit hosts of the Anastrepha spp. of Puerto Rico. We also present the first report of Garcinia intermedia (Pittier) Hammel and Coffea arabica L. as reproductive hosts of A. suspensa.