That's not Sibon nebulatus... and whether the coloration is grey or brown is irrelevant for distinguishing Sibon and Dipsas--there are brown Sibon, such as Sibon dimidiatus (see: http://www.uta.edu/biology/campbell/guatemala/images/Sibon_dimidiata.JPG), and there are grey Dipsas, such as Dipsas indica (see: http://www.animals-online.be/reptiles/ringslangachtigen/bigheaded_snaileating_snake.html). The pattern of the snake pictured fits that of Dipsas indica, but not that of Sibon nebulatus, and AFAIK no Sibon occur in French Guiana.

Patrick Alexander

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