Hi,
It is most likely a C. bicinctores. The true insularis, are only found on Angel island in the sea of Cortez. A special permit is needed to collect them. I have never heard of them making it into any private collections.
C. bicinctores used to be classified as C. insularis bicinctores, but they are now considered a seperate species, not subspecies. The true insularis, look a lot like a baja collared C. vestigium), but without the white cross bars on the body.

Also, the C. colaris (baleyi) is a formerly recognised sub species of colaris. A lot of people still refer to the types of collaris by their former subspecies name. To me, a "classic" male baleyi has a blue-green body, yellow front feet, yellow on the top of the head, with the rest of the head whitish, yellow cross bars on the body, and a blue throat. The main thing that separates them from a yellow head, is the white pigment between the collars, and the lack of a full yellow head.
The Eastern collareds (C. c. collaris) are much more variable in appearance.
I, personally believe in keeping groups seperated by locale, since their taxonomy is always subject to change. I also like to use their former subspecies names to describe the type of collaris in question.
What country are you in?
You could check out Will Wells' site for some good info, and great pictures. http://www.desertreptiles.net/

I hope this helps.
Take Care.
Nick

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