Yesterday I breezed through the small town of Èrshuǐ 二水 in southern Changhua 彰化 to scope out some historic sites on my list. One of these sites, the old Ershui Public Hall 二水公會堂, is located next to a wide expanse of unkempt meadowland, evidently a breeding ground for Taiwan’s only geometrid moth. There were hundreds of brightly-colored, iridescent moths flitting around the overgrown ruins—and many more locked in an embrace on whatever flat surfaces could be found. After coming home last night it didn’t take long to puzzle out the name of this species of moth: Milionia basalis pryeri, a subspecies of Milionia basalis only found in Taiwan and southwestern Japan 日本, particularly Okinawa 沖縄. There appears to be no English common name but in Chinese it is generally known as chengdaizhichi’e 橙帶枝尺蛾; roughly “orange-banded moth”.