During a survey of nasal larvae an unidentified third instar was found in the nasal cavities of a blue wiIdebeest. It was characterized by heavy dorsal and ventral spinulation and is introduced as a new species Oestrus dubitatus. Keywords: Gedoelstial myiasis, Kirkioestrus minutus, Nasal flies, O. dubitatus, O. macdonaldi, O. variolosus, Oestrus aureoargentatus, Pupation and Sclerotized peritremal plates.