TABLE 2.

Confusion among putative species of the North American Ratsnake (Pantherophis obsoletus) complex (Burbrink, 2001) in TD1 and TD2 (the three putative species were combined in TD3). The identity of species in training and testing data was done exclusively from photos, taking into account the geographic location but not information from scale counts or DNA.

Correct ID of testing image	ID suggested by algorithm	Percent confusion in TD1	Percent confusion in TD2
P. spiloides	P. obsoletus	0.31	0.11
P. spiloides	P. alleghaniensis	0.25	0.08
P. alleghaniensis	P. obsoletus	0.13	0.07
P. alleghaniensis	P. spiloides	0.08	0.20
P. obsoletus	P. alleghaniensis	0.05	0.10
P. obsoletus	P. spiloides	0.04	0.13