Genus Trichiotinus

Pronotum brown or black, elytra brown/black center, white stripes along sides: assimilis - mostly northern and western; affinis - similar to piger but elytral intervals 2 and 4 shiny, with scattered large punctures, look same as slightly elevated and convex intervals 3 and 5, and pygidium distinctly and closely rugose; piger - very similar to affinis, but intervals 2 and 4 finely and densely punctate, less shiny than distinctly elevated and convex intervals 3 and 5; pygidium medially distinctly setose, noncretaceous surface with irregular rugae usually separated by less than or equal to 0.2 mm in median area; rufobrunneus - very brown, FL endemic; texanus - TBA

Pronotum green, elytra brown to green in varying degrees, with no or weak white bars: bibens - elytra brown with green tinge, flies in mid-late summer; lunulatus - elytra brighter green than in bibens, flies in late spring and early summer [overlooked in(4)]; viridans - TBA

Hoffman, Clarence (1935). The Biology and Taxonomy of the Genus Trichiotinus (Scarabaeidae-Coleoptera). Entomologica Americana 15(4): 134-209 (BHL link)