Key to species of Sphallambyx

1. Each elytron with five isolated dark maculae (three dorsally, two laterally) (Fig. 14). Colombia, Ecuador, Peru, Bolivia, Brazil (Acre) ............................................................................................................................................... S. superbum (Aurivillius, 1910)

- Each elytron with a large, continuous dark band dorsally and, at most, with a single lateral dark band (Figs 1, 11) ...................... 2

2(1). Head distinctly pubescent (Figs 10, 11); vertex lacking longitudinal sulci (Fig. 11). Brazil (Minas Gerais, Rio de Janeiro, São Paulo, Paraná) ..................................................................................................................................S. chabrillacii (Thomson, 1857)

- Head, at most, sparsely pubescent (Figs 1, 4, 5, 6, 8); vertex with distinct longitudinal sulci (Fig. 1, 4, 6, 8). Mexico (Veracruz), Guatemala, Costa Rica, Panama ............................................................................................S. mexicanum Galileo & Martins, 2007