suefrederick

Here is a chart with pix of the kingsnake/milksnake family. Perhaps you can give him this URL to try to locate his snake on it.
http://www.pitt.edu/~mcs2/herp/Lampropeltis.html

Hope it helps, although if it is an aberrant california kingsnake (I hope that is the right term), it probably won't help.
sue frederick