The detection of two males and one female of Amphipsylla sibirica sepifera
on three Clethrionomys glareolus is pointed out. The rodents were taken in
Alt Aneu and Espot, two towns of Lerida (a Spanish Province). The finding o
f this flea species on Spanish Pyrenees increases to the west its geographi
cal distribution and adds one new species to the Iberian flea fauna.