Yeah, this critter is found in Giza during the dry, I'm not sure about the screen name, but it's the screen toward the left of the map. (between the upper and lower screen, I think). You'll see a bridge and sort of to the east of that area, you'll see two "Urstrix" monsters. If you keep going past them the snake should pop up out of the ground (between the Urstrix and the...what's it called... the "head with legs" monster) as they so often do.

I don't know if I'm making sense, but I know what I'm talking about as I just fought one earlier....ask me again when I'm sober, or maybe someone else can be less vague.

Anyway, happy hunting.