. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Sigmodontine rodents from southeastern Brazil 221. Fig. 14: Mustached Akodon, Akodon mystax (holotype MN 31910 9); skull and molars; GSL, mm; molars, mm; Arrozal, Parque Nacional de Caparaó, Minas Gerais. Comparisons. Akodon mystax is a member of the Akodon boliviensis group or size class defined by Hershkovitz (1990b: 3). Males of all species of the boliviensis group are larger than females in external dimensions. Nearest relatives appear to be Akodon sanc
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Sigmodontine rodents from southeastern Brazil 221. Fig. 14: Mustached Akodon, Akodon mystax (holotype MN 31910 9); skull and molars; GSL, mm; molars, mm; Arrozal, Parque Nacional de Caparaó, Minas Gerais. Comparisons. Akodon mystax is a member of the Akodon boliviensis group or size class defined by Hershkovitz (1990b: 3). Males of all species of the boliviensis group are larger than females in external dimensions. Nearest relatives appear to be Akodon sanctipaulensis (Säo Paulo), A. lindberghi (Brasilia, D. F.), and A. azarae (Paraguay, Argentina and Uruguay). Similarities between Andean and Atlantic region akodonts of the boliviensis group may be more than superficial, but the diagnostic characters of mystax are significant; the karyotype is as yet unknown. The posterolophule (pseudomesoloph) often fused with the posterostyle usually absent in A. mystax is not consistently present in other species. Morphometric differences between the species are slight; comparative measurements of most other members of the boliviensis size class are given by Hershkovitz (1990b: 4—5). Measurements. Table 7. Remarks. Several of the specimens were taken in a small stone house in Terreirao occupied only by the mice until Scott Lindbergh and Alfredo Langguth moved in. A mustache like that of Akodon mystax \s common among sigmodontines, marsupials and other mammals usually as an individual variable. Specimens examined: Total 21. Minas Gerais (Parque Nacional de Caparaó, Terreirao, 2400 m, MN 13; Arrozal, 2300 m, MN 5; Pico da Bandeira, 2700 m, MN 3). Thaptomys Thomas Thaptomys Thomas, 1916: 339. Type species Hésperomys subterraneus Hensel, 1872 (= Thaptomys nigrita Lichtenstein, 1829). The genus Thaptomys Thomas, 1916, one of the most distinctive of the akodontine assemblage has experienced an equivocal systematic history. Ellerman (1941: 406
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