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The genus    Loxosceles    Heinecken &amp; Lowe, 1832 has 91 representatives in the New World. Despite medical relevancy, the taxonomy of the genus is poorly understood. South American    Loxosceles    were divided into four groups of species:  laeta ,  spadicea ,  gaucho  andamazonica   ; this last one has a single species,    Loxosceles   amazonica    Gertsch, 1967. More recently, the natural occurrence of    L.   amazonica    in the New World has been questioned, due to the strong morphological resemblance and close phylogenetic relationship with Old World species, mainly with    Loxosceles   rufescens    (Dufour, 1820). Herein,    L.   amazonica    is rediagnosed and its morphological variation and natural distribution discussed. Two new species closely related to it from northeastern Brazil are also described,    Loxosceles   willianilsoni    sp. n. , from the state of Rio Grande do Norte, and    Loxosceles   muriciensis    sp. n. , from the state of   Alagoas  . The relationships of these new species with    L.   amazonica    and    L.   rufescens    are discussed.

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Two new Brazilian species of    Loxosceles    Heinecken &amp; Lowe, 1832 with remarks on      amazonica    and      rufescens    groups (  Araneae  ,   Sicariidae  )