Lacordaire encouraged him to specialize in Elateridae on which he published revisions of which the very rare Monographie of Elateridae (four volumes, Liège, 1857–1863) is important.
Lacordaire advised him to concentrate on Elateridae, and he subsequently produced revisions of this family, with a notable work being the scarce Monographie of Elateridae (four volumes, Liège, 1857–1863).