Range Description

This species is known only from around Río Frio town, in the State of Mexico close to the borderline with Puebla, in central Mexico, at around 3,000m asl. It has not been found at the type locality for over 30 years, since this area is extremely polluted from the town of Río Frio. However, in 1983 it was still found in three sites in small streams at 9 and 15km to the north-east of Río Frio.