Key to species of Atarphia (couplets in part adapted from Jelínek et al. 2012)

1. A. Elytra with several rows of tubercles bearing tufts of black setae. Body unicolorous, black. Tegmen with acute point at apex, no prominent apical process. Korea, Japan, Far Eastern Russia, China .................... A. fasciculata Reitter (Fig. 1B) B. Elytra without tubercles but with multiple light maculations. Tegmen with rounded apical process..................... 2

2. A. Mesofemora with acute tooth along posterior margin....................................................... 3 B. Mesofemora without acute tooth, lighter coloration along sutural line, posterior elytral maculations distinctly circular, shorter metaventrite (3.3 times as wide as long). Laos ............................. A. mammutha Gregson & Powell (Fig. 1C)

3. A. Pronotum with markedly raised medial bulge near basal margin. Posterior maculation contiguous across suture, making a broad v-shaped bar. China, Korea Taiwan ................................... A. cincta Jelínek, Jia, & Hájek (Fig. 1A) B. Pronotum without medial bulge, posterior elytral maculations small, weak, widely separated. Japan, Korea, Far Eastern Russia ................................................................... A. quadripunctata Reitter (Fig. 1D)