Abstract: An investigation on body and burrow fleas of the Brandt's vole, Microtus brandti, in Narenbaolige Sumu, Abaga Banner, Inner Mongolia, during 1989～1998 was summarized. Nine flea species in 7 genera in 3 families were found on the vole body with Amphipsylla primaris mitis as the dominant species(41.8%),followed by Neopsylla pleskei orientalis (41.2%) and Frontopsylla luculenta (13.2%). Nine flea species in 6 genera of two families were detected in the vole burrow nest with N. p. orientalis as the dominant species (74.9%). F. luculenta (10.0%), A. p. mitis(8.2%) and Rhadinopsylla rothschildi (6.4%) were commonly occurring. There was a positive correlation between the index of A. p. mitis, N. p. orientalis and F. luculenta and that of all the fleas on the vole body (P<0.05), respectively. The correlation coefficient between index of N. p.orientalis, F. luculenta and R.rothschildi and that of the total fleas in the vole burrow nest was significant (P<0.01), respectively. The proportion of burrow flea index to that of body flea was about 5∶1 in spring while it approached 75∶1 in autumn. N. p.orientalis was the dominant species either in the vole body fleas or in the nest ones. Of the vole body fleas 41.8% was A. p. mitis, which belonged to the body type flea. F.luculenta was common flea species on the vole body and in its burrow.

Key words: Brandt's vole Microtus brandti, Amphipsylla primaris mitis, Neopsylla pleskei orientalis, Frontopsylla luculenta, population dynamics