A formal five-way division of the Gaboon Viper Species Complex: Bitis (Macrocerastes) gabonica (Dumeril, Bibron and Dumeril, 1854) and a two-way division of the Nose-horned Viper species complex Bitis (Macrocerastes) nasicornis (Shaw, 1802) (Serpentes: Viperidae: Bitisini). Australasian Journal of Herpetology, 19, 10 July 2013: 25-31. 28 [Zoological Record Volume 149]