Neoperiboeum villosulum Click here for a larger view

Diagnosis.--Key characters: Ommatidial size coarse (Fig. 39b); prosternal process not linear, expanded at apex (Fig. 18); mesal antennal spines present (Figs. 8b, 9b); elytral humeri without epipleural tooth; pronotum with impunctate regions present; pronotum without longitudinal rugosities, transverse ridges, or large, uniformly-sized confluent punctures; femoral carinae absent; procoxal cavities closed laterally (Fig. 24); mesal profemoral apices rounded (as in Fig. 26d); elytra not metallic and without dense golden and/or silver pubescence; procoxal cavities open posteriorly (Fig. 18); tibial carinae present (Fig. 22); femoral apices rounded (Fig. 26); femoral shape clavate (Fig. 37b); pronotum and head without dense yellow or white pubescence; antennomeres carinate, not sulcate (Fig. 45b, c); spine of antennomere three blunt (Fig. 28); antennomere shape linear; elytra with moderate to strong apicolateral spine. Length: 8-12 mm.

Distribution and Diversity.--México to Panamá. Two species.

Discussion.--Based on the implied weighting phylogenetic analysis, Neoperiboeum fell as sister genus to Micropsyrassa, together part of a large, unresolved polytomy (Fig. 50). Additional character analysis and taxa need to be included to better understand the mid-level relationships in that portion of the phylogeny.

Neoperiboeum is easily recognized by the very long pronotum and blunt spine of the third antennomere. It differs from Micropsyrassa, which also has the blunt spine of antennomere three, in not having alveolate pronotal punctation.