Acknowledgements We are indebted to Dr Chris Smeenk for assistance in translating Latin descriptions, the suggestion to check Müller
(1847) for possible details on the type locality and for improving the manuscript. For information on the specimen
of S. formosus in the Natural History Museum, London, U.K., we are indebted to Patrick Campbell. For
information on the ZMA specimens we thank Dr Isaäk Isbruecker. We also thank Bernardo Guillen for making the
photographs of the RMNH specimens and Niko Korenhof for scanning the plate of Müller & Schlegel and
producing the plates. We thank Dr Lynne Parenti and an anonymous reviewer for their helpful suggestions.