My friend Connie Green, who runs the Wine Forest and is known by most everyone as The Mushroom Lady, brought these varieties back from Chiapas.
These were called Ron, as in "rum". Connie said, "You can just tell these are delicious!" and she's right. I found a similar, but smaller bean in Oaxaca a while back.
The black beans, called Ballero, are round and look like small bits of ammo.