Key to the species of Marolia Mulsant, 1856

1. Setae on elytra and pronotum erect........................................................................ 2

- Setae on elytra and pronotum are recumbent................................................................ 3

2. Pronotum base is bulged at the middle and markedly extending beyond the posterior corners of pronotum; punctation of disc of the pronotum sparse, aedeagus as in Fig. 8 ............................................. Marolia alicantina sp. nov.

- Pronotum base almost straight or at the middle only slightly extending beyond the posterior corners of pronotum; punctation of disc of the pronotum dense, aedeagus as in Fig. 9 ............................... Marolia grandis Peyerimhoff, 1917

3. Lateral margins of the pronotum with carina from basis to 2/3 length, interspaces among the punctures of the pronotum are distinctly shagreened.......................................................... Marolia purkynei Mařan, 1933

- Lateral margins of the pronotum with carina from basis to ½ or 3/5 length, between the pronotum punctation are inconspicuous shagreened............................................................................................4

4. Antennomeres thin (Fig 12), posterior corners of the pronotum obtuse, width to length ratio of pronotum 1:1.16 – 1:1.23................................................................................ Marolia variegata (Bosc, 1791)

- Antennomeres thick (Fig 13), posterior corners of the pronotum acute, width to length ratio of pronotum 1:1.23 – 1:1.4............................................................................. Marolia leseigneuri Nicolas, 1977