Abstract: The burrow nest, body and burrow track fleas of the Daurian ground squirrel, Spermophilus dauricus, and their infecting rates in the man-made plague focuses in the suburbs of Harbin,Heilongjiang Province, China were investigated during 1982～1999. Nine flea species were found from the ground squirrel burrow nest,body and burrow track,among which Citellophilus tesquorum sungaris was the dominant species (89.65%) and Neopsylla bidentatiformis came the second (10.26%). There existed significant differences among the flea indexes of the three categories as well as their infecting rates (P<0.01). The correlation between indexes of the burrow nest flea and body flea was significant (P0.05). The indexes of burrow nest flea,body flea and burrow track flea were approximate to 650∶140∶1,and their infecting rates approximate to 165∶88∶1.

Key words: manmade plague focuses, Spermophilus dauricus, Citellophilus tesquorum sungaris, Neopsylla bidentatiformis, population dynamics