Revision of the genus Arthrotus Motschulsky, 1858 (Coleoptera, Chrysomelidae, Galerucinae) of Taiwan, with notes on color polymorphism

Habitus of Arthrotus testaceus Gressitt & Kimoto and A. yangi sp. nov. A A. testaceus, collected from Tahanshan (大漢山), male, dorsal view B A. testaceus, collected from Tahanshan (大漢山), male, ventral view C A. testaceus, collected from Tahanshan (大漢山), male, dorsal view D A. yangi sp. nov., collected from Hualuhsi (華綠溪), male, dorsal view E A. yangi sp. nov., collected from Hualuhsi (華綠溪), male, ventral view F A. yangi sp. nov., collected from Hualuhsi (華綠溪), female, dorsal view.