Ceracis: Antenna 8 or 9-segmented (rarely 10-segmented); prosternum concave or biconcave, never carinate longitudinally in midline; prosternal process usually laminate; body glabrous (covered by very small setae, almost invisible even in high magnifications); protibiae with a row of spines at their apices, not extending to the outer margin. Males usually with a setose patch on first abdominal ventrite, never with a flap cover; secondary sexual characters present in male frontoclypeal ridge and anterior margin of pronotum in most species.

Thanks so much, Cristiano.

It could happen :-) Actually I was going solely by the shape of the distal end of the tibia, not visible in any of these images. (I'll post one now that shows a sharp point or corner.) I really should be doing microphotography of these parts.

As far as habitus goes, you're quite right. This agrees with the Ceraci*s drawings in American Beetles much better than the Cis drawings. I'll check further.