...if I caught a rosy on Whitewater Canyon road, whether it's light, dark, has smooth stripes or more irregular, it's still locale-specific. That's one of the reasons rosys are such fascinating snakes - individuals from one locale may all be quite similar to one another (some of the Mexican Trivs come to mind), or there may be lots of variation in the immediate geographical area. The locales that have that most variable animals can be the most interesting - it's a thrill to find or see something unexpected from a locale you thought you knew well.