Here is a link to a PDF of a recent revision of Epictia blind snakes. The PDF includes E. columbi, the blind snake found on San Salvador Island and features a photo we took on a trip to San Salvador last year. Thanks to Van Wallach for sharing! For more information about blind snakes, see here.
Wallach, V. 2016. Morphological review and taxonomic status of the Epictia phenops species group of Mesoamerica, with description of six new species and discussion of South American Epictia albifrons, E. goudotii, and E. tenella (Serpentes Leptotyphloptidae: Epictinae) 3: 216–374.