_Remarks._--Individuals of _Agkistrodon_ were collected on brushy or wooded hillsides, along rock walls or in piles of rocks, and in damp, rocky, wooded ravines near streams. Many were docile when captured. One specimen was infested with nematodes, another with cestodes. One specimen had eaten a striped field mouse, _Apodemus agrarius_, and another had eaten a gray hamster, _Cricetulus triton_. One female, obtained on May 22, 6 mi. E Seoul, contained 14 embryos. Another female, obtained on August 25 in the Central National Forest, contained three well-developed embryos. We have not included descriptive or taxonomic remarks concerning _A. halys_ because Dr. Howard K. Gloyd, University of Arizona, who currently is studying the systematics of the genus _Agkistrodon_, has our specimens on loan. Gazetteer Listed below are all localities mentioned in the accounts of species; the latitude (north) and longitude (east) are given for each. All place-names can be found in "Gazetteer to maps of Korea," 3 vols., AMS 2, U. S. Army Map Service, September, 1950, and, except for the two marked by an asterisk, can be located on AMS map series L552 (Korea, 1:250,000). The McCune-Reischauer system of romanization of Korean names is used. Changhowan-ni. 37°07´, 127°38´ Central National Forest. A small mixed forest 15-18 mi. NE Seoul and immediately west of the village of Pup´yong-ni; most of our collecting there was done approximately at 37°45´, 127°10´ Cheju Do (Quelpart Island). A large island in the East China Sea off the southwestern tip of the Korean mainland (see Mosulp´o and Sogwi-ri) Chip´o-ri. 38°08´, 127°19´ Choksong. 37°58´, 126°57´ Ch´onan. 36°48´, 127°09´ *Ch´ongyang-ni. 38°15´, 127°23´ Ch´orwon. 38°15´, 127°13´ Ch´ungju. 36°58´, 127°57´ Halla San. A central, volcanic mountain on Cheju Do (see above) Hoengsong. 37°29´, 127°59´ Inje. 38°04´, 128°11´ Kangnung. 37°45´, 128°54´ Kumhwa. 38°17´, 127°28´ Kunsan. 35°59´, 126°43´ Kwangju. 35°09´, 126°55´ Majon-ni. 37°52´, 126°46´ Mosulp´o. 33°13´, 126°15´ Naegong-ni. 37°41´, 127°10´ Oho-ri. 38°20´, 128°32´ Osan. 37°09´, 127°04´ Pup´yong-ni. 37°44´, 127°12´ Pusan. 35°08´, 129°04´ P´yong-taek [= P´yongt´aeng-ni]. 36°59´, 127°05´ Sangbonch´on-ni. 37°27´, 127°16´ Sangdaehwa. 37°30´, 128°26´ Seoul. 37°32´, 127°00´ Sogwi-ri. 33°15´, 126°34´ Songdong-ni. 38°01´, 127°16´ Taegwang-ni. 38°11´, 127°06´ *Taehoesan-ni. 38°04´, 127°14´ Taejon. 36°20´, 127°26´ Tangjonggok. 38°11´, 128°19´ Tangnim-ni. 37°50´, 127°37´ Uijongbu. 37°44´, 127°03´ Wonsan. 39°09´, 127°27´ Yami-ri. 38°03´, 127°16´ Yanggu. 38°06´, 128°00´ Yongdae-ri. 38°13´, 128°23´ Yongp´yong. 38°01´, 127°13´ Literature Cited BABB, G. H., JR. 1955. An annotated checklist of the amphibians and reptiles of Korea. Bull. Philadelphia Herp. Soc., 1:17-23. BOGERT, C. M., AND OLIVER, J. A.