Genus Scoloderus Simon, 1887

Diagnosis. Scoloderus species can be easily distinguished from other Araneidae genera by the following characteristics: a bulging, helmet-shaped carapace without two knobs, high clypeus of at most two-and-a-half diameters of the anterior median eyes, a pedicel generally attached to the posterior third of an abdomen that is not projected anteriorly (Traw 1996; see Levi 2002, figs 38–39).

Distribution. USA to Argentina.

Composition. Scoloderus ackerlyi Traw, 1996, S. cordatus (Taczanowski, 1879), S. gibber (O. Pickard-Cambridge, 1898), S. neilli sp. nov., S. nigriceps (O. Pickard-Cambridge, 1895), and S. tuberculifer (O. Pickard-Cambridge, 1889) .