Michal Minas commented on a previous post (# 121) with a link to this picture of a Drymaeus species, taken at Uxmal, Yucat??n, Mexico. It is probably D. serperastrus (Say, 1830).
The picture was made by Maximilian Paradiz and posted in a Photostream on Flickr containing mostly pictures of amphibian and reptiles (http://bit.ly/lM4gVx). One of which is this snail eating snake (Sibon sanniola (Cope, 1866), the Yucat??n snail-eater or Pygmee snail-sucker), which I now add to my list of snail predators.