External characteristics of the eggs and the ultrastructure of wax-secreting pores and sensory pits of all five nymphal stages and the adults of the planthopper Euricania clara Kato, 1932 are described and illustrated using both light and scanning electron microscopy (SEM). A key to five nymphal instars of Euricania clara is provided. The structure of stomata-like wax pores on different parts of the adult body and the distribution of nymphal sensory pits and wax plates are described and compared with 6 other species of Ricaniidae. This study shows that ultrastructural features on the egg surface vary among species of Ricaniidae. The patterns of wax-pore plates and pits on abdominal segment 6 can be used to distinguish two allied genera, Pochazia and Ricania. Wax-secreting plates on the ventral surface of the anal tube of the female adult can be used to distinguish the genus Euricania from Pochazia and Ricania.
