Males and females are distinguished in the following manner: In the genus Lichnia, the male protibia is slender, whereas the female protibia is broader for its entire length. In the genus Arctodium, the male tibial apex is modified into a long, pointed spine, whereas the female tibial apex forms only a short, blunt spine.
-
1.
.
 Galea at least 1/3 body length. Mandible rounded, without apical teeth
(5) Lichnia Erichson
 

1'.
. .

Galea length less than 1/3 body length. Mandible dentate,
with 2 apical teeth
(2) Arctodium Burmeister
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2(1).
.		 Eye canthus with fringe of long, pale setae
.
 

2'.

 Eye canthus with fringe of long, dark setae
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3(2).
.
.

Body length from apex of pronotum to apex of pygidium 5.0–6.5 mm. Male metatibia with apical spine shorter than adjacent metatibial spur

 

3'.
.
.

Body length from apex of pronotum to apex of pygidium greater than 7.0 mm. Male metatibia with apical spine subequal to or longer than adjacent metatibial spur 

.
.
4
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4(3).
.
 Elytra as long as wide. Setae of posterior leg dark brown or black, never pale
 

4'.
.

 Elytra longer than wide. Setae of posterior leg variable, but never black
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5(1).
.

Antennal club of males shorter than segments 1–6. Occurs in Region IV (Coquimbo)
 

5'.
.

Antennal club of males longer than segments 1–6 combined. Occurs in Region V (Valparaíso) to Region VII (Maule)