Catopyrops, a genus of Lycaenidae previously unrecorded to Taiwan, was found from Lanyu, an island southeast of Taiwan. The collected samples, identified as C. ancyra almora, presumably invaded from the Philippines by natural pathways. This species might have established successfully because samples were being obtained four years after its discovery at Lanyu. Possible larval hosts include Pipturus arborescens (Urticaceae), Caesalpiniαspecies (Fabaceae) and Glochidion species (Euphorbiaceae), thus this butterfly has the potential to invade the main island of Taiwan and the other islands along the eastern coast of Taiwan.