The leaf-rollers (Lepidoptera, Tortricidae) of western Tuva, with description of Cochylimorpha arenosana sp. n.

A list of 145 species of the family Tortricidae, recorded from the western part of Tuva, is presented. The material studied originates from a joint Fi nnish-Russian expedition made in June 1995. Additional data have been taken from Ukrainian, Russian and German literature. Cochylimorpha arenosana n. sp. from sand dunes of Northern Mongolia is described. Three species, False uncaria lechriotoma Razowski, 1970, Acleris idonea Razowski, 1972 and Eucos ma argentifera Razowski, 1972 - all described from Mongolia - are reported as new for Russia. From the total of 145 species 138 can be placed into thr ee main zoogeographical complexes: Holarctic/Palaearctic about 83%, Mediter ranean-Central-Asiatic about 10% and endemic for the mountains of Central-A sia about 7%. The Holarctic complex can be divided into four chorological g roups: Holarctic (22 spp.), Transpalaearctic (65 spp.), Western Palaearctic (12 spp.) and Eastern Palaearctic (13 spp.). Subalpine meadows and grazed steppes of Mongun-Taiga and the Tannu-Ola Mnts. are inhabited by some endem ics of the Central-Asian mountains (11 spp.).