Etymosphaerion unicolor Click here for a larger view

Diagnosis.--Key characters: Ommatidial size coarse (Fig. 39b); prosternal process expanded at apex (Fig. 18); mesal antennal spines absent; lateral projections into mesocoxae from mesosternum (Fig. 20); antennomere three about two-thirds length of pronotum (Fig. 46b); antennae 12-segmented; elytral apices without spines, truncate to rounded; pronotum sparsely to moderately punctate (not confluently so); pronotum with five vague, smooth, impunctate regions; elytra concolorous; femora clavate (Fig. 37b); femoral apices rounded (Fig. 26). Length: 6-7 mm.

Distribution and Diversity.--Bolivia. Monotypic.

Discussion.--No specimens were available for inclusion in the phylogenetic analysis and therefore the relationship of Etymosphaerion to other genera cannot be determined in this work. Martins & Monne (1975) state that "the absence of spines on the antennae suggests affinities between Etymosphaerion and Hesperophanini, but the procoxal cavities are not angulate (open) laterally as in hesperophanines (translated)." These characters are not consistent for either tribe, however.

The 12-segmented, unspined antennae, wide pronotum with five indistinct calli, rounded elytral apices, and small size distinguishes this genus from others in the tribe.