In addition to the tail count, you need to count the scales from the chin to the vent. From my understanding, equal to or less than 154 is a male, and greater than 154 is a female. Of course the closer to 154 either direction the less 'accurate'. FYI, when I started this out 4 years ago, I counted scales on all the freshly shed snakes I could, and from 32 snakes that I can recall counting, only 1 counted out as a male but was in fact a female . . .
D80