44–46. Heads and pronota of 5th instar larvae, right lateral views. 44 Drusus mixtus (Pictet, 1834) (dotted line: base of high pronotal hump) 45 Drusus bolivari (McLachlan, 1880) 46 Drusus chauvinianus (Stein, 1874) (= Anomalopterygella chauviniana (Stein, 1874). 47–48. Heads and pronota of 5th instar larvae, frontal views. 47 Drusus bolivari (McLachlan, 1880) 48 Drusus chauvinianus (Stein, 1874) (= Anomalopterygella chauviniana (Stein, 1874). 49 Drusus ramae Marinkovic-Gospodnetic, 1971, 5th instar larva, pronotum, right lateral view. Scale bars: 0.5 mm.