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One hundred Korean terrestial snakes,i.e.,7 Elaphe rufodorsata,17 E. dione, 10 Dinodon rufozonatum rufozatum,37 Natrix tigrina lateralis,21 Agkistrodon blomhoffii brevicaudus,6A.calibinosus and 2A. saxatiilis were examined from June 17, 1981 to Jun 1, 1982, to observe the fauna of Korean cestode parasities. They were collected from 13 localities of southern Korea: i.e., Chunseong Gun, Hong-cheon Gun, Hoengseong Gun, Weonseong Gun, Samcheog Gun, Gangweon Do; Namyangju Gun, PAju Gun, Ganghwa Gun, Gyeonggi Do; Youngdong Gun, Jeweon Gun, Chungcheongbug Do; Jangheung Gun, Jeonlanam Do; Sancheong Gun, Gyeongsangam Do and Bugjeju Gun, Jeju Do respectively. The results could be summarized as follows: 1. A total of 61 snakes was found to be infected withsparganum larvae of Spirometra mansoni out of 100 examined. Snakes from 11 localities were infected. By species of snake, N.t. lateralis and A.b. brevicaudus showed the higher infection rates. The mean density was 11.0 per examined snake and 18.1 per infected snake respectively. A. caliginosus and A. saxatilis were new hosts of spatganum in Korea. 2. Trtrathyridium of Mesocestoides sp. was found in one snake, Elaphe rufodorsala collected from ChunSeong Gun, Gangweon Do. A total of 16 tetrathyridia was found at serosa and mesemtery of the snake. The morphology of the larvae was described. This was thr first record of recovery of thtrathyridia in any vertebrate intermediate host in Korea. Elaphe rufodorsata was a new host. 3. proteocephalus japonensis(Yamaguti, 1935) n.comb.(syn.: Ophiotaenia Japonensis Yamaguti, 1935) were found in 10 snakes which were collected from Hongcheon Gun, Weonseong Gun, Namyangju Gun, Paju Gun, Jeweon Gun, and Sancheong Gun repectively. The infected snakes were Agkistrodon blomhoffii brevicaudus, A. caliginosus, A. saxatilis and Natrix tigrina lateralis. The habit was small instetine. The measurement data and morpholigy were described. The preaently observed worms were longer than those of original description and was a difference in mumber of uteerine branches. A. blomhoffii brevicaudus, A. caliginosus, A. saxatilis were new hosts for this protecephalid cestode. Korea was added to list of the locality.
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