Larvae of Bembidiini (Coleoptera : Carabidae): Subtribes Tachyina and Xystosomina

Larvae of 13 species of the bembidiine subtribes Tachyina (the genera Tachy ta Kirby, Tachys Dejean, Polyderis Motschulsky, Elaphropus Motschulsky, Sph aerotachys G. Muller, Paratachys Casey, Porotachys Netolitzky) and Xystosom ina (the genus Mioptachys Bates) were studied. Larvae of all studied taxa a re described, diagnosed and illustrated. A key to genera is provided separa tely for the first- and older-instar larvae. Monophyly and phylogenetic pos ition of the subtribes and genera are discussed on the basis of presumably apomorphic character states of larvae. Based on at least six synapomorphic character states the subtribes Tachyina and Xystosomina appear to form a mo nophyletic group. On the other hand, there are no synapomorphies to propose a sister-group relationship between Tachyina and Xystosomina within the su pertribe Trechitae.