1.
.
 Antennae 8 segmented, pronotum quadrate,
trapezoidal, posterior margin weakly tridentate,
often medially recessed (Fig. 4).

Fig. 4 Pronotum, dorsal view
.

1'.
.

Antennae 9 segmented, pronotum rectangular, trapezoidal, posterior margin tridentate (Fig. 5).
 

Fig. 5 Pronotum, dorsal view