Key to the species of Sorolopha from Vietnam based on forewing maculation

1. Forewing mostly pale gray, fuscous, or brown, with darker brownish, pinkish, or purple markings, lacking green........ 2

- Forewing predominantly green or bluish gray (well developed or at least clearly visible)............................. 5

2. Forewing dorsum with postbasal spot...................................................................... 3

- Forewing dorsum without postbasal spot................................................................... 4

3. Postbasal spot not reaching middle of wing (Fig. 2).................................................. archimedias

- Postbasal spot reaching middle of wing (Fig. 3)....................................................... cyclotoma

4. Median fascia extending from costa ca. 2/5 distance from base to apex, connected with preterminal spot (Fig. 4)... semiculta

- Median fascia extending from costa ca. ½ distance from base to apex, not connected with preterminal spot (Fig. 5)................................................................................................... plinthograpta

5. Forewing predominantly bluish gray or bluish green (Figs. 6, 7)................................................. 6

- Forewing predominantly light green or olive green (Figs. 8–10)................................................. 7

6. Forewing bluish-gray, median fascia dark blue, slightly dilated toward middle of wing, and broadest in middle of wing, slightly narrowed at costa and dorsum (Fig. 6)............................................................ sphaerocopa

- Forewing bright glossy bluish-green, median fascia dark fuscous, conspicuously narrower in costal 1/2 of wing (Fig. 7)................................................................................................. rubescens

7. Forewing light green, median fascia abruptly narrowed at middle, tangulate below fold, forming a triangular spot on dorsum (Fig. 19)................................................................................. cucphuongensis

- Forewing olive- green to light moss-green, median fascia variable.............................................. 8

8. Median fascia straight, slightly enlarged anteriorly from middle to the tornus with dark fuscous posterior edge (Fig. 8)................................................................................................... ghilarovi

- Median fascia not straight and strongly dilated at middle of wing................................................ 9

9. Median fascia well-defined, deep green, dilated above the fold, basal fascia well defined, separated from median by conspicu- ous white incision on fold (Fig. 9)................................................................. herbifera

- Median fascia dark green at costa, yellow-brownish at middle, dilated below fold with fern-green mixed with light cyan at dor- sum (Fig. 10)............................................................................. chiangmaiensis