.................................................................................................................................................................2 Resumen ................................................................................................................................................................2 Introduction .................................................................................................................. .......................................................3 Taxonomic history ..................................................................................................................................................3 Natural history ........................................................................................................................................................5 Material and methods ............................................................................................................................................5 Results and discussion ........................................................................................................ .. .. .. ..................................6 Key to Plochionocerus and related genera ........................................................................................................... 9 Plochionocerus Dejean, 1833 ................................................................................................... . .. . ............................9 Key to the species of Plochionocerus .............................................................................................................................. 10 Plochionocerus ashei Asiain, Márquez & Morrone, sp. nov. ....................................................................................13 Plochionocerus discedens (Sharp, 1885) ................................................................................................................ ...13 Plochionocerus fulgens (Fabricius, 1793) ............................................................................................................ 14 Plochionocerus gracilis Asiain, M·rquez & Morrone, sp. nov. .................................................................................16 Plochionocerus hermani Asiain, Márquez & Morrone, sp. nov. ...............................................................................17 Plochionocerus humeralis (Sharp, 1885) ................................................................................................................ ...17 Plochionocerus igneus (Fauvel, 1901) ............................................................................................................... 19 Plochionocerus impressipennis (Sharp, 1891) ...........................................................................................................20 Plochionocerus janthinus (Erichson, 1847) ............................................................................................................. 22 Plochionocerus marquezi Asiain, 2006 ................................................................................................................. 23 Plochionocerus modestus Asiain, Márquez & Morrone, sp. nov. .............................................................................24 Plochionocerus newtonorum Asiain, Márquez & Morrone, sp. nov. ........................................................................24 Plochionocerus pronotalis Asiain, Márquez & Morrone, sp. nov. ............................................................................25 Plochionocerus puncticeps (Sharp, 1885) ................................................................................................................ .26 Plochionocerus reticularis Asiain, Márquez & Morrone, sp. nov. ............................................................................27 Plochionocerus simplicicollis (C. Waterhouse, 1879) ...............................................................................................28 Plochionocerus splendens (Blanchard, 1842) ............................................................................................................ 33 Plochionocerus transversalis Asiain, M·rquez & Morrone, sp. nov. ........................................................................36 Agrodes Nordmann, 1837 stat. rev. .....................................................................................................................41 Key to the species of Agrodes .............................................................................................................................. 46 Agrodes conicicollis Sharp, 1876 ..................................................................................................................47 Agrodes elegans Nordmann, 1837 ............................................................................................................... ..............47 Acknowledgements .............................................................................................................................................49 References ...........................................................................................................................................................49 Appendix ...................................................................................................................... ...........................................50