[Main traits of the annual cycles of the fleas (Aphaniptera) of the mountain suslik in the Baksan River valley].

Data are given on the fleas of Citellus musicus from Central Caucasus. Ecological peculiarities of fleas from the above region were compared with data known for fleas from plain Precaucasus. Differences between annual cycles of fleas of the same species from two altitude belts of the Baksan valley are considered. Epizootological significance of ecological peculiarities of fleas in the Baksan plague nidus is discussed.