Genus Cathartosilvanus Grouvelle, 1912

Note. The studied amber specimen shows the combination of characters unequivocally corresponding to the subfamily Silvaninae: subparallel body shape; pentamerous tarsi with tarsomere 4 smallest; closed procoxal cavities; 11-segmented antennae with distinct, loose antennal club; antennal scape comparatively short, about as long as wide; frons laterally without longitudinal sulcus; and frontoclypeal suture absent.

The beetle under consideration is assigned to Cathartosilvanus based on the combination of the following characters: (1) lateral sides of pronotum not dentate; (2) anterolateral denticle on pronotum present and located behind anterior margin of pronotum; (3) all tarsomeres simple (not lobed and not incrassate); (4) abdominal ventrite 1 with femoral lines open; (5) antennomere 8 not narrower than antennomere 7; (6) antennal club 3-segmented with first segment narrower than second; (7) antennomere 11 not obviously elongate; (8) antennomeres without spines; and (9) apical segment of labial palp not smaller than previous segment.