The invasive avian vampire fly, Philornis downsi (Diptera: Muscidae), poses a significant threat to Darwin's Finches and other endemic bird species in the Galapagos Islands, and the importation of specialized natural enemies is a promising strategy for its long-term control. The parasitoid Conura annulifera (Hymenoptera: Chalcididae) has received the most attention as a potential biological control agent thus far, including st...