Males have HUGE heads compared to females. Females (and juviniles) tend to have a whitish stripe down their backs. Males are bigger overall.

You should be able to see the huge head of the male in the first picture and the stripe of the female in the second.

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~Sara~
4 Leopard Geckos
4 ball pythons
1.0 Black-lined plated lizard (Lizzy Butt)
0.1 Burmese Python (Pixil)
5 Rats
6 Mice
1.1 Gerbils
1.1 Dogs (Ozzie and Mandy)
0.1 Cat (Isis)
0.0.1 Synodontis Catfish (Big Spotty Fish)
0.1 Convict Cichlid
0.0.1 blood parrot cichlid
0.0.1 African Featherfin Catfish