| Sassacus paiutus (Gertsch, 1934) |
| Sassacus papenhoei G. W. Peckham & E. G. Peckham, 1895 |
| Sassacus samalayucae Richman, 2008 |
| Sassacus vanduzeei Chamberlin, 1924 |
| Sassacus vitis (Cockerell, 1894) |
| Semiopyla Simon, 1901 |
| Semiopyla cataphracta Simon, 1901 |
| Sidusa Peckham, 1895 |
| Sidusa nigrina F. O. Pickard-Cambridge, 1901 |
| Sidusa perdita (Banks, 1898) |
| Sitticus Simon, 1901 |
| Sitticus cautus (Peckham & Peckham, 1888) |
| Sitticus palpalis (F.O.P.-Cambridge, 1901) |
| Sitticus peninsulanus (Banks, 1898) |
| Sympolymnia Perger & Rubio , 2020 |
| Sympolymnia edwardsi (Cutler, 1985) |
| Synageles Simon, 1876 |
| Synageles mexicanus Cutler, 1988 |
| Synageles noxiosus (Hentz, 1850) |
| Synemosyna Hentz, 1846 |