Palaearctic, Oriental Regions. Until more evidence to the contrary is available from critical studies of patterns of variation, I shall treat them as parts of a single variable species.
Further evidence is awaited.
This convention has since changed and recent authors have consistently used s . Palaearctic, Oriental Regions. This convention has since changed and recent authors have consistently used s . I have seen no type specimens, but the description is consistent with this interpretation. B. fulvescens is therefore likely to be the oldest available name for this species.