Thirteen species of Arrenurus DugÞs, 1834 from S. W. China, Laos and Burma are examined, of which, A. (Arrenurus) dengi sp. n., A. (A.) jaingi sp. n., A. (A.) veliserratus sp. n., A. (A.) xini sp. n., A. (Micruracarus) bipetiolatus sp. n., A. (Truncaturus) athertoni sp. n., A. (T.) corpuscularis sp. n. and A. (Truncaturus) micropetiolatus sp. n. are new to science. New records of A. (A.) hamatus Lundblad, A. (A.) liberatus Lundblad, A. (A.) pseudoaffinis Piersig, A. (A.) rouxi Viets, A. (Micruracarus) madaraszi Daday, A. (M.) pisciscaudapetiolatus Marshall are presented and the female of A. (Micruracarus) asiaticus Marshall is described for the first time. Descriptions of the structure of the petiole are given.