1.
.
 Labrum horizontally produced with respect to clypeal apex (Fig. 1), distinctly separated from clypeus
.
2
 

1'.
.

Labrum vertically produced with respect to clypeal apex (Fig.2) and more or less fused to clypeus
.
3
......................
Figure 1. Head, lateral view, with labrum horizontally produced with respect to the clypeus. C=clypeus, L, =labrum, M=mandible.   Figure 2. Head, lateral view, with labrum vertically produced with respect to the clypeus. C=clypeus, L, =labrum, M=mandible.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2(1).
. 		Margin of elytra with membranous border. Antenna 9-segmented
 

2'.
.
.
.

 Margin of elytra without membranous border. Antenna 10-segmented (except in Parachrysina (Areodina), Eremophagous (Pelidnotina), and female Pseudogeniates richterianus (Pelidnotina)]
.
.
Rutelini
KEY
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3(1).
. 		Mentum and labrum each with median, apical tooth
or projection (Fig. 3)
.
5
 
3'.
. 		Mentum lacking median, apical tooth or projection; labrum with or without median, apical tooth or projection (Figs. 4, 5)
.
4
...
...
Figure 3. Head (frontral view) showing labrum and
mentum with median, apical tooth (Geniatini and Anoplognathini).
  
Figure 4.Head (frontral view) showing labrum mentum with median, apical tooth; mentum lacking tooth (Adoretini).
  
Figure 5.Head (frontral view) showing labrum and
mentum lacking median,
apical tooth (Spodochlamyini).

C=clypeus, L=labrum, M=mentum
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4(3).
. 		Labrum with median, apical projection; apex overhanging mentum (Fig.4)
.
Adoretini
 

4'.
.

Labrum and mentum both simple, lacking median, apical projection (Fig. 5)
.
Spodochlamyini
...............
Figure 4.Head (frontral view) showing labrum mentum with median, apical tooth; mentum lacking tooth (Adoretini).   Figure 5.Head (frontral view) showing labrum and mentum lacking median,
apical tooth (Spodochlamyini).

C=clypeus, L=labrum, M=mentum
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5 (3).
. 		Protarsomeres dorsoventrally flattened and expanded apically in males and/or males and females (Fig. 6)
 

5'.
.

Protarsomeres simple, not dorsoventrally flattened and expanded apically in males or females (Fig. 7)
......................
Figure 6. Dorsal view of protarsomeres of Geniatini.
Figure 7. Dorsal view of protarsomeres of Anoplognathini.