Key to the species of the subgenus Symplecthyma Rivalier, 1964

1 Abdominal sternites light brown (Figs 1a, b)................................................................ 2

- Abdominal sternites entirely metallic (Fig. 1c).............................................................. 4

2 Meso-, metasternum, metepisternum and abdomen light brown (Fig 1a).......................................... 3

- Mesosternum, all episterna and sides of metasternum metallic, central part of metasternum and abdomen light brown (Fig. 1b)................................................................................ P. (S.) kapuka sp. nov.

3 Striae on vertex strong; pronotum gently transversally rugate; elytra coarsely punctate; yellow apical band of elytra reaching suture along margins (Fig. 11). Head as wide as elytra (mean EW/HW = 1.0)................... P. (S.) inopinata sp. nov.

- Striae on vertex shallow, pronotum smooth; elytra shiny, sparsely and weakly punctate; yellow apical band of elytra rounded (Fig. 10). Head wider than elytra (EW/HW = 0.89).................................... P. (S.) incerata Rivalier, 1964

4 Punctures on elytral surface rounded at base and behind humeri; transverse, narrow and often confluent on the disc; becoming squamiform in posterior part............................................................................ 5

- Elytra uniformly sculptured laterally and on the disc. Punctures deeply impressed and rounded, slightly transverse in apical part; never squamiform. Body slender, upper side mate, blue or coppery red (Figs 4–5)........ P. (S.) coerulea Horn, 1920

5 Aedeagus elongate, narrow in basal third and gradually widened on dorsal side to the middle (Figs 7, 9)................ 6

- Aedeagus short, abruptly widened immediately from the base (Figs 3, 13)........................................ 7

6 Dorsal side of body shiny, with bright copper and green reflections. Anterior half of pronotum smooth and shiny (Fig. 6). Body relatively robust. Apex of aedeagus narrow, with rounded hook spiral sclerite of endophallus with two full coils at base (Fig. 7)................................................................................. P. (S.) eureka sp. nov.

- Dorsal side of body dull, dark copper. Pronotum evenly, transversely rugate throughout (Fig. 8). Apex of aedeagus slightly wider, with down turned tip; spiral sclerite of endophallus wide, with two and half full coils at base (Fig. 9)...................................................................................... P. (S.) heteromallicollis Horn, 1909

7 Pronotum dull, densely transversely rugate. Disc of elytra with coarse transverse punctures, becoming confluent in apical half. Aedeagus short and robust; apex short and wide, with thick hook; spiral sclerite of endophallus wide, with one and half full coils at base (Fig. 13).................................................................. P. (S.) sciaky sp. nov.

- Pronotum shiny, moderately transversally rugate. Apex of aedeagus not thickened, with more or less pointed hook-shaped denticle; spiral sclerite of endophallus long and narrow, with three full coils at base (Figs 2–3).................................................................................................... P. (S.) aeneoparva Horn, 1934