The American orb-weaver genera Cyclosac Metazygiac and Eustala north of Mexico lAraneaec Araneidaer

Five species of Cijclosa, three of Meiazygia and thirteen of Eusiala are found in the region. One species of Cijclosa is holarctic in distribution, others are temperate and tropical American. The rarity of the dwarf males of the tropical Florida Cijclosa hifurca suggests that the species may be parthenogenetic. Metaztjgia and Ettstala are known from the Americas only, most species being tropical. The five temperate species of Eiistala, especially the three eastern ones, are difficult to separate; possibly they hybridize in some areas. Two of the Eustala species are new, with the range of southern Florida and the West Indies.