Ninia sebae morleyi
(Schmidt & Andrews 1936)
Yucatán, Mexico. June 27, 2016.
These small, semi-fossorial snakes get their common name from coffee groves, where they are often found among the leaf litter. When handled they tend to flatten and spread their necks.
My Flickr album for Yucatán 2016 is here.
HerpMapper records for this species are here.