It is found in Japan in the southern Ryukyu Islands, specifically in the Yaeyama Islands.[1] The type locality is unknown. Boulenger listed it as "---- ?" while Gray's original 1849 description gives "West Coast of [North?] America." A restriction to "Ishigaki-Shima [Ryukyu Islands, Japan]" was proposed by Stejneger (1907).[2]
^ abMcDiarmid RW, Campbell JA, Touré T. 1999. Snake Species of the World: A Taxonomic and Geographic Reference, Volume 1. Herpetologists' League. 511 pp. ISBN1-893777-00-6 (series). ISBN1-893777-01-4 (volume).
^Mehrtens JM. 1987. Living Snakes of the World in Color. New York: Sterling Publishers. 480 pp. ISBN0-8069-6460-X.
^Brown JH. 1973. Toxicology and Pharmacology of Venoms from Poisonous Snakes. Springfield, Illinois: Charles C. Thomas. 184 pp. LCCCN 73-229. ISBN0-398-02808-7.
^Seiko Matsuda. 沖縄県における平成23年の毒蛇咬症 [2011 Venomous Snakebite in Okinawa Prefecture] (PDF) (in Japanese). Okinawa Prefectural Institute of Health and Environment, Hygiene Science Group Eiko Maho. Archived from the original(PDF) on 2013-05-02. Retrieved 2013-03-11.
Gray, J.E. 1849. Catalogue of the Specimens of Snakes in the Collection of the British Museum. Trustees of the British Museum. London. xv + 125 pp. (Craspedocephalus elegans, p. 7.)