| Summary: | In the year 1895 Trouessart described a new species: Sternostomum rhinolethrum 1) (at present known as Rhinonyssus rhinolethrum (Trouessart, 1895)) from the nasal cavities of the Domestic Goose, Anser anser (L.).\nTrouessart\'s description was preliminary, but the promised complete description with figures in the Bulletin de la Soci\xc3\xa9t\xc3\xa9 Zoologique de France was never published.\nStrandtmann (1956, pp. 137-140) and Fain (1957, pp. 42-44) have sufficiently explained that the species R. rhinolethrum is not the type species of Sternostomum Trouessart, 1895, an invalid emendation of the generic name Sternostoma Berlese & Trouessart, 1889, and that it does not even belong to the genus Sternostoma. It should be placed in the genus Rhinonyssus.\nIn 1904 (pp. 28-30, figs. 42-47, Pl. 1 figs. 1, 3, 8) Tr\xc3\xa4g\xc3\xa5rdh described under the name Sommatericola levinseni nov. gen. nov. spec. 2) a similar species, found by Prof. Levinsen in the nose of the Eider, Somateria mollissima (L.), on Greenland. It seems that Tr\xc3\xa4g\xc3\xa5rdh was not aware of Trouessart\'s paper, as he does not refer to it at all.\nYet Tr\xc3\xa4g\xc3\xa5rdh must have seen some of Trouessart\'s papers, as on p. 29 he makes a comparison with the genus Ptilonyssus.\nIn his description of Sommatericola levinseni Tr\xc3\xa4g\xc3\xa5rdh made various mistakes, the most confusing being that his "male" was in reality a deutonymph (no dorsal shield), so that he did not observe a real male at all.\nHis fig. 44 shows typically the claws of a nymph. The tarsal setae are incorrectly represented, as in reality the sensorial area of tarsus I shows hairs of a different shape and arrangement. Therefore all Tr\xc3\xa4g\xc3\xa5rdh\'s con-
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