Quadrideres simplicipes (Gebien, 1910)

Key to the species of the Q. simplicipes species-group

1 Inner contours of male protibae with conspicuous postmedian dilatation.................................................................................................... Q. interioris species-group (see Kamiński 2013a: 93)

- Inner contours of male protibae without postmedian dilatation................................................ (2)

2 Secondary intervals and epipleurae of elytra with fine punctures......... Q. scutatus species-group (see Koch 1956: 192)

- Secondary intervals and epipleurae of elytra with coarse punctures.................. Q. simplicipes species-group... (3)

3 5th abdominal ventrite without margin ( Fig. 10 View FIGURES 5–11 )............................................................ (4)

- 5th abdominal ventrite with complete margin ( Fig. 9 View FIGURES 5–11 ).............................................. Q. simplicipes

4 Pronotal base with strong lateral indentations ( Fig. 7 View FIGURES 5–11 ). Emargination of pronotal base interrupted laterally ( Fig. 7 View FIGURES 5–11 ). Pronotum widest at 0.75 of its length ( Fig. 7 View FIGURES 5–11 )...................................................... Q. kazimierzi sp. nov.

- Pronotal base with fine lateral indentations ( Fig. 8 View FIGURES 5–11 ). Emargination of pronotal base complete ( Fig. 8 View FIGURES 5–11 ). Lateral sides of pronotum widest at the base … (5)

5 Protibae with shallow distal cavity on the inner side. Punctuation on the head, pronotum and elytra coarse. Body size: 10.0– 12.0 mm..................................................................................... Q. robynsi

- Protibae with relatively deep distal cavity on the inner side ( Fig. 11 View FIGURES 5–11 ). Punctuation on the head, pronotum and elytra relatively fine. Body size: 8.5–10.5 mm ................................................................. Q. parallelus