Abstract
1. 1. Transferrins of numerous snakes were compared by microcomplement fixation and immunoelectrophoresis. 2. 2. The evidence was used to test the validity of current, conflicting classifications of colubrid snakes. 3. 3. Natricine, colubrine and xenodontine snakes seem to have diverged to the family level. 4. 4. Within the natricine snakes, species of Natrix from Europe and Asia were more divergent from Thamnophis than were species of Natrix from North America. 5. 5. Homalopsis and Acrochordus showed little affinity to either natricine or colubrine species.
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