New specimens of the genus Hapalotremus (Theraphosinae) are revised based on the examination of types and additional material collected in Argentina, Bolivia and Peru. A new generic diagnosis is proposed. New information and illustrations are provided for known species and seven new species were recognized and are newly described and illustrated. Hence, Hapalotremus comprises 10 valid species, distributed along the Andes and Yungas in western South America. All species are keyed and mapped. New taxonomic features are included in the descriptions and the detail of embolus keels morphology and positions are described for the first time for the genus. Information on species habitat is included. The highest altitude record for a Theraphosidae spider, living at 4524 m above sea level, is reported.
Acanthoscurria sacsayhuaman sp. nov. (Araneae: Theraphosidae) is described based on a male from Cusco,
Peru. The new species is characterized by the absence of stridulatory bristles on retrolateral face of palpal
trochanter. Moreover, it can be distinguished by morphology of the male palpal bulb and tibial apophysis of the
first pair of legs. The genus is recorded for the first time for Peru.