Abstract
It has long been well known that the American watersnakes of the genus Natrix embrace a group of small species very distinctively different from other members of the genus. This, the Regina group, consists of four species: N. grahami (Baird and Girard), N. septemvittata (Say), N. kirtlandi (Kennicott), and N. rigida (Say). The present study is an investigation of the degree of skeletal distinction existing between this group and other American Natrix as exemplified by the three species and subspecies N. s. sipedon (Linne), N. erythrogaster transversa (Hallowell), and N. r. rhombifera (Hallowell), all referred to here for the sake of convenience as constituting part of a sipedon group.
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