Ninety-eight aquatic habitats in east-central and southeast Arizona were sampled for tiger salamanders during 1977-79. These collections indicate two taxa in the region: Ambystoma tigrinum nebulosum and A. t. mavortium. A. t. nebulosum is a native species and is commonly associated with natural and artificial aquatic habitats in montane conifer forests, interior chaparral and subalpine grasslands at elevations > 1,500 m. It was collected in both lotic and lentic habitats. A. t. mavortium is probably introduced, and was collected in artificial lentic habitats in Sonoran desertscrub and semi-desert grassland at elevations < 1,600 m. Both taxa occur in intermediate elevation plains grassland and conifer woodland habitats.