The investigation results of the flea indices and similarity indices of flea communities on 8 species of small mammals in the southern part of the Ximalaya Mountain, near the southern border of Qinghai Tibet Plateau, during the period from 1992 to 1994.Altogether 1805 specimens were collected from the small mammals, and they were identified as 45 species and subspecies of fleas, belonging to 4 families, and 22 genera. After calculation of flea indices and similarity indices, PCA was used to analyse flea ...