I’m not finding any specific information about collection dates nor sites. I will continue doing Internet searches to hopefully find some. If you know of any, or know of anyone who does, please reply with a URL link or other citation that I can research.

Here is a wild snake found at the coast at Melaque, between Puerto Vallarta & Manzanillo, just barely north of the Colima border:

http://steveinmexico.blogspot.com/2011/03/down-by-old-tropical-stream.html