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[The larval development of the warble-fly Oestromyia leporina Pall. (Deptera, Hyodermah'dae) (author's transl)].

The present paper deals with the larval development of the warble-fly Oestromyia leporina and especially with the development of the first instar larvae (L 1). The hatching from the egg and the modus of infection is described. The migration of the L 1 within the host is reported for the first time as well as the perforation of the skin after the migration period. Exact dates on the duration of the different larval stages are given. Experimental infection reveals a partial immunization of the host against new infections. Some remaining problems of larval biology are discussed. By comparison several facts suggest our present knowledge of the perforation of larval (L 1) Hypoderma bovis probably to be wrong.