Key to the Korean species of Europiella

1. Basal (1/3–2/3) region of antennal segment II dark........................................................... 2

- Extreme base of antennal segment II darker, or entirely pale.................................................... 3

2. Body less than 3.5 mm, entirely pale or brownish or black; dorsum brown or greenish brown, or black with pale areas on inner lateral sides of eyes, and lateral margins of mesoscutum; antennal segment I darker. Male genitalia (Fig. 4 A–D): Endosoma with two unequal apical processes, short process curved opposite of the long one (Fig. 4 A). Female genitalia (Fig. 4 E): Sclerotized rings anteriorly oval, and posteriorly straight................................................. E. artemisiae

- Body 4.0– 4.6 mm large, usually pale green in texture, basal 1/3 of antennal segment II black or darker, segment I with large dark spots; and hind femora with distinct black spots (Fig. 3 C). Male genitalia (Fig. 4 F–J): Endosoma twisted mesially, and apical processes curved inwardly as in figure 4J. Female genitalia (Fig. 4 F): Sclerotized rings oval.......... E. kiritshenkoi

3. Body size 4.5 mm, dorsum often green (dead specimen sometime brownish), hind femora with both small and large spots apically (Fig. 3 E). Male genitalia (Fig. 5 C–F): Endosoma with broad and curved apical processes and a leafy chitinised structure arise mesally (Fig. 5 C). Female genitalia (Fig. 5 G): Sclerotized rings distinctly asymmetrical and oval........ E. miyamotoi

- Body less than 4 mm, posterior 2/3 of hind femora with aggregated minute spots arranged in rows..................... 5

4. Body pale green, hind femora with small and large black spots distally, arranged irregularly, these followed by two rows of aggregated minute spots towards base but not extending to base (Fig. 3 B). Female genitalia (Fig. 5 A): Sclerotized rings oval, with wide posterior and narrow anterior region......................................................... E. gilva

- Body pale green, hind femora with few dark aggregated spots ventrally, arranged in rows and extended to base (Fig. 3 D); and bases of tibiae with dark spot. Female genitalia (Fig. 5 B): Sclerotized ring oval; posterior wall with somewhat chitinised membrane......................................................................................... E. livida