.......Arctodium Burmeister, 1844
.......Syn. Cratoscelis Erichson, 1835

Arctodium vulpinum (Erichson). Photo by Mary Liz Jameson.
FIGURES 2a–b. Dorsal view of labrum and mandibles showing form of the mandibles (a) dentate, Arctodium vulpinum or (b) rounded, Lichnia limbata.
Maps of distribution of Arctodium species.

Description. Length (from the anterior margin of the prothorax to the apex of the pygidium) 4.5–12.5 mm; width 3.0–8.0 mm. Head strongly deflexed. Mandibles protruding anteriorly beyond labrum; apices with 2 apical teeth, strongly reflexed. Maxilla with moderately long galea, galea 1/2 to subequal in length to head (including mouthparts), setose; setae curved, short, dense, forming row. Eye completely divided into dorsal and ventral regions by canthus. Antenna 9-segmented. Elytron length short, not covering pygidium.

Diagnosis. Arctodium is differentiated from Lichnia by the shorter galea in Arctodium that is less than half the length of the entire body. In Lichnia, the galea is more elongated and extends at least half the length of the entire body. Also, the mandible of Arctodium is toothed, whereas the mandible of Lichnia is smooth and rounded.

Distribution. The distribution range for Arctodium extends further south than that of Lichnia. Species of Arctodium are found in central Chile from Region V (Valparaíso) to Region IX (La Araucania).

Composition. The genus Arctodium includes 4 species:

(click on a name for a species profile)
Arctodium discolor (Erichson, 1835)
Arctodium mahdii Hawkins, 2006
Arctodium planum (Blanchard, 1850)
Arctodium vulpinum (Erichson, 1835)

Reference:
Hawkins, S. J. 2006. Revision of the Chilean tribe Lichniini Burmeister, 1844 (Coleoptera: Scarabaeidae: Melolonthinae). Zootaxa 1266: 1-63.