Abstract
A new species of the genus Constempellina Brundin, 1947, C. tokunagai sp. n., from the Russian Far East is described and figured as male, pupa and larva. The male and pupa of C. brevicosta (Edwards 1937) are redescribed and figured. Consequently, the generic diagnosis is emended. Keys to the males, pupae and larvae of Russian Constempellina are also given.