23 October 1983.
Puebla, Mexico
Locality: Road from Tehuacan to Oaxaca turning off at Coxcatlan towards Zoquitlan, 22 km along this road, 1 km past LaGriega towards Coyomeapa.
Coordinates: 18.3328, -97.0669
(Map it)
Elevation: 2640m.
Environment description: Under big oaks, near a small stream.