|MadSci Network: Zoology|
Your best bet is to get a good field guide for the region. One with decent pictures is a start but it should also include information as to scalation (number of mid body scales, head scales, etc...). Cheers, B Admin note: Field guides are available at your local library or most any bookstore. I also found a key to the genera of colubridae at: http://pc65.frontier.osrhe.edu/hs/science/zosnake2.htm
Try the links in the MadSci Library for more information on Zoology.