[Diagnosis of species of the genus Dermacentor Koch from Central Asia by the nymphal phase (Ixodoidea, Ixodidae)].

A key to nymphs to five species of Dermacentor from central Asia is given. To recognize differential characters laboratory nymph from the parents identified previously by the authors were reared. D. montanus and D. pavlovskyi are studied from one, D. reticulatus and D. niveus from two and D. marginatus from four geographical areas. The shape of scutal scapulae, structure of the anal valve, proportion and topography of peritremes, shape, size and number of scutal setae, shape of alloscutal and pleiral setae, proportions of auricles, hypostome, cheliceral bases and different parameters of palpal joints, structure and size of coxae I-IV and tarsi I, sizes of scutum and different parameters of gnathosoma are taken for specific diagnostic characters. The differential characters were checked on laboratory nymphs of D. reticulatus, D. niveus and D. marginatus and on those collected beyond the territory of Central Asia.