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. |
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1.
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Galea at least 1/3 body length. Mandible rounded, without apical teeth |
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1'.
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Galea length less than 1/3 body length. Mandible dentate,
with 2 apical teeth |
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2(1).
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Eye canthus with fringe of long, pale setae
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2'.
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Eye canthus with fringe of long, dark setae |
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3(2).
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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 |
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3'.
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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 |
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4(3).
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Elytra as long as wide. Setae of posterior leg dark brown or black, never pale |
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4'.
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Elytra longer than wide. Setae of posterior leg variable, but never black |
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5(1).
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Antennal club of males shorter than segments 1–6. Occurs in Region IV (Coquimbo) |
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5'.
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Antennal club of males longer than segments 1–6 combined. Occurs in Region V (Valparaíso) to Region VII (Maule) |
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