It says... "xenoderminae contains the odd- scaled snakes. this subfamily is named after the Oriental xenodermus, in which the various sized dorsal scales are rather uniquely arranged in patterns. Four furthergenera occur in Southeast Asia and two more in tropical Central and South America. Little is known about the biology of these snakes at the present time, and they rarely turn up in the hobby. It has been suggested that they require humid, tropical conditions in the Terrarium. Xenodermus is a faily plain brown snake with a lighter underside. It grows to about 26 in/ 65 cm in total length and feeds largely on frogs." In SNAKES keeping and breeding them in captivity by John Coborn
There is also a pic of Xenodermus javanicus and it looks kind of grey.