A cladistic analysis of the Attacobiini spiders (Corinnidae, Corinninae) is made from 11 species in the tribe, plus two Corinninae outgroup species (Septentrinna yucatan and Falconina gracilis), scored for 70 characters. Attacobiini, Attacobius and a group composed by A. attarum Roewer, A. luederwaldti (Mello-Leitão) and A. nigripes (Mello-Leitão) are the best supported clades in the analysis. Six new Brazilian species are described: Attacobius blakei, A. tucurui and A. uiriri, from the state of Pará; A. lamellatus and A. kitae, from Tocantins and A. carranca, from Tocantins and Bahia. The known distribution ranges of A. attarum and A. luederwaldti are extended from Rio de Janeiro to Brasilia (Distrito Federal) and from São Paulo to Minas Gerais and Mato Grosso, respectively. A 10 percent KOH preparation of the male palp of A. carranca suggests that the Attacobiini tegular process is homologous to the median apophysis, which is putatively symplesiomorphic in Corinninae.