Silvanoprus angusticollis (Reitter, 1876) (Coleoptera: Silvanidae)—A New Alien Species in the European Part of Russia

First records of Silvanoprus angusticollis (Reitter, 1876) (Coleoptera: Silvanidae) were obtained from the European part of Russia. So far, this Asian beetle species was recorded in Russia in Eastern Siberia. First records from European Russia came from Saratov and Yaroslavl oblasts. Records of Silvanoprus angusticollis in different regions of European Russia probably show that this species was not distinguished from similar silvanid flat bark beetle species. Distinctive details of the morphology of this species are illustrated.