Xylosandrus gemzanus (Blandford) (= Xyleborlus germanus), a sexually dimorphic beetle. was first described in 1894 from specimens collected in Japan; it is now also known from Korea. the Kuril Islands, Vietnam, China, Taiwan, central Europe, and the U.S. ("Sobuchi 1981).
Weber, B. C. and McPherson, J. E.
"The Distribution of Xylosandrus Germanus in America North of Mexico (Coleoptera: Scolytidae),"
The Great Lakes Entomologist: Vol. 15
, Article 6.
Available at: https://scholar.valpo.edu/tgle/vol15/iss3/6