Until we have DNA evidence to suggest otherwise, I consider the 'rufescens' phase to be a locality based wild type phenotype (similar to 'dodoma' kenyans, etc...). So in simple terms.... I consider them to be the same species (Eryx colubrinus) until proven otherwise.

Cheers,
Chris
-----
Christopher E. Smith
Contact
Captive Bred Herps
Wildlife Research & Consulting Services, LLC