Five new species and novel descriptions of opposed sexes of four species of the spider genus Attacobius (Araneae: Corinnidae).

Five new Brazilian species of the spider genus Attacobius Mello-Leitão, 1925 are described: A. demiguise n. sp. (based on male and female) and A. carimbo n. sp. (male), both from State of Pará; A. thalitae n. sp. (male) from the State of Minas Gerais; A. lauricae n. sp. (male) from State of Tocantins; and A. tremembe n. sp. (female) from State of Piauí. The males of A. luederwaldti (Mello-Leitão, 1923) and A. verhaaghi Bonaldo Brescovit, 1998, and the females of A. uiriri Bonaldo Brescovit, 2005 and A. blakei Bonaldo Brescovit, 2005, are described for the first time. Additionally, new records of A. attarum (Roewer, 1935), A. carranca Bonaldo Brescovit, 2005, A. kitae Bonaldo Brescovit, 2005 and A. tucurui Bonaldo Brescovit, 2005 are given.