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In a recent paper * attention was called to the fact, first made known by Wallace, that where a serpent inhabits both the mainland and adjoining islands individuals captured on the islands frequently possess the larger number of vertebrae. This has been examined into and found to hold true for a great many species, including members of the Colubridas, Najidse, and Crotalidae. An endeavor is being made to ascertain exactly which portion of the vertebral column becomes involved in the process of lengthening. In the present species it is the caudal region alone. The island specimens of Natrix mbakari (Boie) have been reported from Hondo, Shikoku, and Eaushu, three of the four principal islands of Japan. None have been reported from Hokkaido, the northern island. The mainland specimens have been captured at Khabarovka, Vladivostok, and Possiet Bay in the Ussuri Province of Siberia, and from Fasan in southeast Korea. If the sum of the gastrosteges and the urosteges in each specimen be plotted in linear fashion, it may be seen at a glance that the examples from the islands have the larger number of vertebrae.

The variation exhibited by mainland and island specimens of the Hibakarisnake, Natrix vibakari (Boie)