That is a beautiful Bitis nasicornis
I know this is an old thread but this nicely illustrates that even after several years and the publication of a paper detailing a supposed 5 way division in Mr Hoser's "Journal", a google search for "Bitis hoserae" still only throws up a small number of "hits" all pretty much originating from Hoser himself. Its good to see that people aren't taking any notice of his alternative amateur 'taxonomy" ....... Taxonomic revision ought to be left to real Scientists !