An examination of scalation and dentition of specimens in Brussels (IRSN), Tervuren (MRAC) mostly Bredo collection, and London (BMNH) from Angola, Congo-Kinshasa and Zambia suggests the existence of a species which is neither P. sibilans leopardinus of which the type is from Namibia, nor P. 'sibilans' mossambicus) of Congo-Kinshasa and Zambia, but a new species previously unnamed.