THE LARVAL MINE OF STIGMELLA-LAPPOVIMELLA (SVENSSON, 1976) ON SALIX-LAPPONUM (L) (LEPIDOPTERA, NEPTICULIDAE)

The larval mine of Stigmella lappovimella in leaves of Salix lapponum of different host leaf thickness is described and differences between the mine and the mines of Stigmella salicis on Salix caprea and Stigme lla zelleriella on Salix repens are noted. The best diagnostic charact ers differentiating the mine of S. lappovimella from the two others wa s the almost unbroken frass line in the first half and the limited fra ss particle dispersion in the second half of the mine. Wing length was also measured and a small but statistically significant difference wa s observed between S. lappovimella and S. zelleriella.