Experiments in hybridizing the warble flies Hypoderma lineatum (de Villers) and H. bovis (Linnaeus) (Diptera: Oestridae)

The taxonomic characters in about 23% first- and 8% second-instar larvae of Hypoderma bovis (Linnaeus) and H. lineatum (de Villers) collected in nature were sufficiently aberrant to suggest hybridization. However, similar aberrations were found in larvae from known intraspecific matings.Measurements of genitalia indicated no morphological barrier to cross-mating. Cross-mating in both directions was achieved in the laboratory with transfer of active sperm to the spermathecae. None of the eggs laid by cross-mated females showed embryonic development. The possibility is discussed of eradicating warble fly populations by encouraging cross-mating to produce non-viable offspring.