Number of Occurrences
Note: For many non-migratory species, occurrences are roughly equivalent to populations.
Estimated Number of Occurrences: 6 - 20
Comments: Occurrences have not been delineated using consistent criteria, so the number of occurrences is uncertain. However, given that the distribution may not be continuous within the range, likely there are several to many distinct occurrences. The map in Degenhardt et al. (1996) suggests that populations in New Mexico comprise not more than 2-3 distinct occurrencs. Dixon (2000) indicated records in 10 counties in Texas. Iverson (1992) mapped a few dozen collection sites that might represent at least 15-20 distinct occurrences.