Key to species of Isopedhispa

1. Dorsum mostly brown to black (Figs 93, 101, 117, 118), distinctly convex; pronotum with numerous coarse and foveolate punctures (Figs 97, 105, 122)............................................................................2.

- Dorsum entirely ferrugineous (Fig. 108), strongly depressed; pronotum almost as long as broad, finely and shallowly punctate on anterior third (Fig. 112).......................................................... I. ferruginea Spaeth, 1936

2. Pronotum rather densely punctate, only narrow medial line impunctate, punctures densely arranged with interspaces mostly narrower than puncture diameter (Figs 105, 122); elytral margin broadly explanate; punctation of elytra moderately coarse, dense and shallow (Figs 101, 117, 118)....................................................................3.

- Punctation of pronotum forming groups on sides of disc, posterior half of disc largely impunctate, punctures sparsely disposed, interspaces mostly larger than puncture diameter (Fig. 97); lateral margins of elytra very narrow; punctation of elytra very coarse and sparse, punctures with deep fovea (Fig. 93)..................................... I. cocotis (Maulik, 1933)

3. Larger species, length 11.45–12.95 mm; pronotum very distinctly macro- and micro-punctate, punctation very dense thus disc without continuous impunctate medial line (Fig. 105); explanate margins of elytra completely black; elytral interval 5 costate on whole length, interval 7 costate behind the middle, interval 9 costate in anterior half (Fig. 101)........ I. costata sp. nov.

- Smaller species, length 6.60–9.50 mm; pronotum densely punctate but with conspicuous impunctate medial line, micropunctation very fine and sparse (Fig. 122); explanate margins of elytra mostly or completely ferrugineous; elytral intervals not costate, only interval 7 elevated behind the middle and interval 9 more or less elevated in anterior half (Figs 117, 118)............................................................................................ I. latemarginata sp. nov.