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The tarantula genus    Sericopelma    was originally defined based on male specimens, most notably lacking tibial spurs on leg I. Early female specimens were unrecognised as    Sericopelma   , and typically placed in    Eurypelma    – a dumping ground for problem specimens. The first females were only later recognised, but authors failed to adequately define female    Sericopelma   . Here, the holotypes of the southern-most alleged    Brachypelma    species,    B.   embrithes    (Chamberlin &amp; Ivie, 1936) and    B.   angustum    Valerio, 1980 were examined, and finding both to possess defining characteristics of    Sericopelma    were transferred. The taxonomic attributes to define    Sericopelma    relative to    Brachypelma    and select other Neotropical genera are discussed, especially for females. As important diagnostic characters for    Sericopelma   , the single (unilobar) spermathecae swollen at the apex forming a P-shaped cross-section, metatarsus IV with trace scopula, femur IV with a dense retrolateral pad of plumose hair, plus other attributes. Some past confusion in these characters are clarified and    Sericopelma    relative to    Brachypelma    and    Megaphobema   mesomelas    are discussed. Finally recommendations are given about these taxonomic changes for  CITES  regulations.

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Revised generic placement of    Brachypelma   embrithes    (Chamberlin &amp; Ivie, 1936) and    Brachypelma   angustum    Valerio, 1980, with definition of the taxonomic features for identification of female    Sericopelma    Ausserer, 1875 (  Araneae  ,   Theraphosidae  )