ABSTRACT Nungara gen. nov. is proposed to include the type species, Nungara niveomaculata (Mello-Leitão, 1941) comb. nov., transferred from Olios Walckenaer, 1837 and two new species, described from males and females: N. anama sp. nov., from the states of Sergipe, Alagoas and Espírito Santo, and N. gaturama sp. nov., from the states of Sergipe, Bahia and Espírito Santo, all in Brazil. The new genus is distinguished from all other Neotropical sparassid genera by the presence of a deep tegular groove on the male palpal bulb and a hood-like projection on the median septum of the female epigyne. In addition, Olios fuscovariatus Mello-Leitão, 1943, Stasina koluene Mello-Leitão, 1941 and Polybetes proximus Mello-Leitão, 1943 are transferred to Nungara gen. nov. and considered junior synonyms of N. niveomaculata . All species are described and illustrated and a distribution map is provided.

A new species of Stygnidae Simon, 1879, Imeri ajuba sp. nov., is described based on males and females from Coari, Amazonas, Brazil. The new species, differs from the only other species of the genus, Imerilomanhungae Pinto-da-Rocha & Tourinho, 2012, in having the following characteristics: three white marks on posterior margin of dorsal scutum, one white mark on free tergite I, three pairs of tubercles on area I, one pair of tubercles on area II, femur IV with ventromesal row of five tubercles, truncus of penis with six pairs of setae on lateral and ventral sides and ventral plate with two pairs of distal setae on dorsal portion.

Neste texto apresentamos um breve histórico dos Encontros de Aracnólogos do Cone Sul (EACS), uma reunião de aracnólogos sul americanos realizada a cada dois anos desde 1997. Os dados foram obtidos a partir dos livros de resumos e mostram a importância dessas reuniões para o desenvolvimento da pesquisa em aracnologia na América do Sul.

Here we present a brief history of the "Encontros de Aracnólogos do Cone Sul (EACS)", a meeting of mostly South American arachnologists held every two years since 1997. Data compiled from the abstract books show how these meetings have contributed towards the development of South American arachnological research.