A new species of Mesotretes (Trematoda: Mesotretidae) parasitizing the small intestine of Rhinolophus ferrumequinum was obtained by the examination of 48 bats collected from 4 localities in Henan Province, China, from August 2003 to January 2005. This species, Mesotretes jiyuanensis n. sp., is similar to Mesotretes orientalis and Mesotretes hangzhouensis, but mainly differs from them in the ratio of the oral sucker and the ventral sucker, and the distance of the intestinal bifurcation from anterior edge of acetabulum, as well as from the former in the extension of the vitellarium. Mesotretes jiyuanensis n. sp. differs from Mesotretes peregrinus chiefly in the shape of the testes and the distribution of cuticular spines. The ratio of the oral sucker and the ventral sucker in this species also differs from that of M. peregrinus.

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