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K'UNG FAN-YAO AND YANG NIAN-HE(Peking Agricultural College)  
For the new strongylid parasite found on donkeys in Peking, the authors propose the name Cylicocydus pekingensis. The diagnostic characters of this new species are as follows:1. One of the larger cyathostomes. Adult male 15.8-17mm in length, with maximum width 0.84-1.0 mm. Adult female 18.5-20.02 mm in length, with maximum thickness 1.07-1.11 mm.2. Leaf-crowns: Externals composed of about 88 long and pointed elements; internals composed of an equal number of long elements.3. External dorsal ray arising from the base of the dorsal. Dorsal ray bifurcating and from about the same level of bifurcation giving off on either side one lateral branch. Each inner trunk bifurcating at about its distal third.4. Female: Posterior extremity ending in a small knob; vagina very short. The authors propose to divide the genus Cylicocydus into three subgenera.(1) Cylicocydus (Cylicocydus) Ihle, 1922.-Buccal capsule generally long and Cylindrical. Elements of the external leaf-crown generally long, those of the internal leaf-crown very small. Containing the species: C. radiatum, adersi, auriculatum, elongatum, gyalocephaloides, insigne, nassatum and triramosum.(2) Cylicocydus (Cylicobrackytui) (Cram, 1924).-Buccal capsule extraordinarily short. Containing the species: C. brevicapsulatum, and prionodes.(3) Cylicocydus (Hsiungia), subgen. nov.-Elements of the internal leaf-crown long and prominent. Containing the species: C. pekingensis, sp. nov., and ultrajectinum.
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