[Larval migration of the Oedemagena tarandi botfly in an artificial infestation of deer]

After penetrating the skin the first instar larvae spread diffusively and rather evenly in the subcutaneous and intermuscular conncective tissue over the whole body of a deer and do not migrate upwards. The number of larvae in the intermuscular tissue decreases with age and increases in subcutaneous cellulose. During migration their growth varies much that can be partially explained by the heterogeneity of the tissus they advance ahead. On the places of larval localisation a granulomatose inflammation appears with a prevalence of lymphoid cells in the infiltrate and location haemorrhages into surrounding tissues.