What is "psilopogon"

Psilopogon is a genus of Old World barbets that used to include a single species, the Fire-tufted barbet in the past. Molecular phylogenetic studies found the genus to be nested within an evolutionary branch consisting of barbets placed in the genus Megalaima and therefore they were not distinct. Since Psilopogon was described by Muller in 1835-36, well before the genus Megalaima was erected by G. R. Gray (in 1841), it takes priority.