Key to Myrmecorhynchus species

1

 * Mesosomal dorsum and legs with abundant erect hairs => Myrmecorhynchus emeryi, Myrmecorhynchus musgravei and Myrmecorhynchus rufithorax (see Notes below)




 * Mesosomal dorsum with at most a few scattered erect hairs, legs with appressed pubescence but lacking erect hairs => 2



2

 * Extensive yellow on clypeus covering at least 1/3 of surface; mandibles completely yellow (except dark teeth) => Myrmecorhynchus nitidus




 * Clypeus generally completely dark, at most with a narrow band of yellow on anterolateral margin; mandibles bicoloured, yellow basally and dark apically => Myrmecorhynchus carteri



Notes
 * It would appear that M. emeryi and M. rufithorax represent colour forms of a single, variable species. There is currently no reliable way of separating these taxa.
 * M. musgravei was described from a single male and is likely to belong to the M. emeryi-rufithorax complex and not to represent a distinct species.