I can't tell you how to tell the different (currently recognised) subspecies of V albigularis apart, but I can tell you where to look. Books aren't the answer.

When a new species gets described, the scientist(s) involved must publish the information in a scientific journal. Included in that information is a description of what makes that subspecies or species differ from closely related species/subspecies in the same complex. Don't expect fabulous photographs, but there will be scale counts or whatever feature(s) they've used to distinguish it.

Finding the specific journal which has the description you are after will involve a search through a local university library. You'll have to get the librarian to show you how to search the abstracts for the particular article, or get markb to point you in the right direction by supplying the title and year of the publications.

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