Key to Plochionocerus and related genera

1. Head with lateroventral furrows (Fig. 15), ventral surface with expanded, umbilicate punctures (Figs. 50, 51, 53; except P. hermani, Fig. 52); elytral hind margin with depression or notch (Fig. 59) .............. ........................................................................................................................................... Plochionocerus

1’. Head without lateroventral furrows (Figs. 10, 16), ventral surface lacking expanded, umbilicate punctures, (Figs. 48, 67); elytral hind margin without depression or notch (Fig. 58) ..................................... 2

2(1’). Head more than 1.5 times as long as wide (1.54–2.00 times; Fig. 3), with lateral margins convex (Fig. 10); fore margin of labrum with two pairs of small, lateral teeth and one pair of central, larger teeth (Fig. 37); apical palpomere of labium elongate (Fig. 42); prosternum slightly oblong (length/width ratio 1.04–1.20; Fig. 67) ........................................................................................................................ Agrodes

2’. Head 1.5 times or less as long as wide (Fig. 4), lateral margins with a flat or depressed area delimited by two carinae (Fig. 16); fore margin of labrum with two pairs of lobes or teeth of variable length (Fig. 33); apical palpomere of labium slightly widened toward apex (Fig. 41); prosternum transverse (length/ width ratio 0.65–0.88) ...................................................................................................................... Renda