Key to species of subgenus Parena with elytra uniformly yellow to dark brown

1. Postgenae with a pair of long suborbital setae, similar in length to supraorbital setae................................ 2

- Postgenae without suborbital setae, with a few very short setae in some specimens................................. 5

2. Dorsum dark brown; elytra with deep and wide depressions on anterior third of intervals 3–6; Madagascar ........................................................................................... [37] P. stigmatica (Fairmaire)

- Dorsum yellowish brown; elytra at most with very shallow depressions.......................................... 3

3. Antennae completely yellow; Oriental Realm......................................[25] P. fasciata (Chaudoir) (part)

- Antennae bicolored, with basal three or four antennomeres yellow, apical antennomeres nearly black; African continent.... 4

4. Antennomere 4 entirely yellow; lateral margins of pronotum strongly sinuate before posterior angles; elytral disc slightly darker than lateral areas; elytral striae clearly incised, finely punctate; intervals with dense fine punctures; Angola ............................................................................................... [38] P. dorae Basilewsky

- Antennomere 4 with yellow basal half and dark apical half; lateral margins of pronotum almost straight before posterior angles; elytra evenly yellowish brown; elytral striae faintly incised, formed by rows of punctures; intervals with very sparse fine punctures; Tanzania, Zimbabwe ................................................................ [39] P. fulva sp. n.

5. Elytral apices distinctly truncate, outer apical angles prominent, sutural angles pointed, forming sharp spines; Madagascar .......................................................................... [40] P. madagascariensis (Alluaud)

- Elytral apices evenly curved, outer apical angles completely rounded, sutural angles not pointed....................... 6

6. Dorsum dark brown to piceous; elytra with large and deep depressions before middle of intervals 3 to 6.............................................................................................. [32] P. politissima (Chaudoir)

- Dorsum yellowish to reddish brown; elytra disc with shallow depressions before middle of intervals 3 to 6.............. 7

7. Elytral striae shallowly incised; antennae with apical antennomeres nearly black, much darker than basal three or four antennomeres; African species............................................................................... 8

- Elytral striae deeply incised; antennae with apical antennomeres brown, at most only slightly darker than basal antennomeres; Oriental-Australian species............................................................................. 9

8. Elytral striae very shallow, completely smooth in posterior half; lateral margins of pronotum slightly sinuate before posterior angles; tarsi dark brown, much darker than tibiae..................................... [42] P. ferruginea (Chaudoir)

- Elytral striae slightly deeper, very shallowly incised but present even in posterior half; lateral margins of pronotum clearly sinuate before posterior angles; tarsi yellow, same color as tibiae.......................... [44] P. africana (Alluaud) (part)

9. Elytra dark reddish brown; apical lamella of aedeagus wider, LL subequal to LW; Australasian species................................................................................................ [29] Parena picea (Macleay)

- Elytra light reddish brown; apical lamella of aedeagus narrower, LL slightly longer than LW; Oriental species................................................................................... [28] P. nigrolineata (Chaudoir) (part)