APPENDIX 1.

A key to the species of Cacomorphocerus

(1) Antennae strongly modified with antennomeres 3-9 saucer-shaped ...2

   - Antennae slightly modified with antennomeres 6-7 dilated ...C. eocenicus sp. nov.

(2) Pronotum with impression or incision ...3

   - Pronotum without impressions and incisions ...4

(3) Pronotum with longitudinal impression ...C. cerambyx

   - Pronotum with deep transversal and sinuous incision medially ...C. madseni

(4) Pronotum anteriorly rounded and protruding ...C. bentifabrici

   - Pronotum not anteriorly protruding ...5

(5) Pronotum rectangular with two oblong tubercles on disc ...C. jantaricus

   - Pronotum sub-rectangular without tubercles on disc ...C. wiszniewskii