A list is presented containing data on chromosome numbers and sex determining mechanisms of90 species of Argentina beetles, belonging to the families Staphylinidae (2 spp.), Meloidae (3 spp.), Elateridae (1 sp.), Coccinellidae(5 spp.), Tenebrionidae(l1 spp.), Scarabaeidae(30 spp.), Cerambycidae (3 spp.), Chrysomelidae (27 spp.), Curculionidae (7 spp.) and Lampyridae (1 sp.). Asphaera t-album (Chrysomelidae) had n = 10 + X + 6y; in Epicauta atomaria (Meloidae) individuals with 2 n = 22,21 and 20 were found.
The subfamilies Bulininae and Biomphalariinae are of medical importance being potential intermediate hosts of human and herbivore schistosomiasis. South America is inhabited by the subfamilie Biomphalariinae. Biomphalaria glabrata (=Australorbis glabratus) is the principal host of Schis tosoma mansoni in Brazil. In Argentina there are no cases of schistosomiasis as yet although Biomphalaria tenagophila, of extensive distribution in this country, has proved to be also host (Rey 1956). Previously eight papers were devoted to the cytogenetics of the subfamily
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