Dr. Kassai Tibor - Dr. Murai Éva szerk.: Parasitologia Hungarica 10. (Budapest, 1977)

M. agrestis, as well as from M, oeconomus these authors confirmed that S. petrusewiczi was not involved in that material, consequently this name should be deleted from Norway. In contrast to WIGER et al. (1976) we found that M. oeconomus may serve as host of S. nigeriana in Norway. Fig, 1: Syphacia nigeriana Baylis, 1928 (Orig. ) A) Anterior end, en face view B) Anterior end, lateral view After the evaluation and comparison of our material it.may be concluded that the main hosts of S. nigeriana in the territory of Norway are members of the genus Microtus, particularly M. agrestis, C. glareolus acts only as an occasional host. 2. Aspiculuris tetraptera (Nitzsch, 1821) Locality and host: Oslo (A. sylvaticus); Localization: small intestine; Incidence and intensity: 2%, 3 specimens. Description: Only 3 females were found, one of them was sexually mature, with typical characters of the genus Aspiculuris Schulz, 1924. Body length 4.4 mm, maximum width 0. 31 mm. Esophagus with bulb 0. 5 mm, bulb 0.16 mm long. Three strong lips and head vesicle on anterior end of body. Lateral alae distinctly cut out in región of bulb and extending further in a