In this later paper he went on to recognise kurilensis as conspecific with B. tichenkoi, but then, despite having regarded kurilensis as a subspecies of what he now believed to be B. yezoensis in the earlier paper, listed B. tichenkoi as a species separate from B. yezoensis . He even noted the allopatric distributions of B. tichenkoi and B. yezoensis between the northern and southern Kurile Islands and the resemblance of tichenkoi and dark individuals of yezoensis , especially in workers. Until more evidence to the contrary is available from critical studies of patterns of variation, I shall treat B. tichenkoi and B. yezoensis as parts of a single variable species. Japanese, Palaearctic Regions. I have as yet seen no evidence that more than one species is involved.
More evidence is awaited.
B. sushkini and B. saltuarius for two separate species. Oriental, Palaearctic Regions. The two taxa are closely similar. Depending upon the species concept embraced, such subtle differences as those between B. reinigiellus and B. hortorum might be expected even within a single population and I shall treat all three taxa as conspecific for the present. More evidence is awaited.