Adiposphaerion rubrum Click here for a larger view

Diagnosis.--Key characters: Coarsely faceted eyes (Fig. 39b); prosternal process between procoxae expanded slightly apically (Fig. 18); rounded lateral pronotal tubercles (Fig. 12e); small mesal antennal spines (Figs. 8b, 9b); elytra without humeral tooth and unarmed at apices; procoxae open laterally (Fig. 17); no mesocoxal projections from mesosternum (Fig. 20); unarmed femoral apices (Fig. 26); glabrous body except for sparse, erect flying hairs (Fig. 16); clavate femora (Fig. 37b); distinctive red elytra with apical fifth black; pronotum with five small dorsal prominences. Length: 16-17 mm.

Distribution and Diversity.--North-central Brazil (Amazonas, Rondônia). Monotypic.

Discussion.--This rare and distinctive taxon and may indeed merit its own genus; however, the characters used by Martins and Napp (1992) to define it are widespread among many elaphidiine taxa. Until additional specimens can be obtained to allow for disarticulation, its affinities are not certain. Martins and Napp (1992) believed this genus to be very close to Periboeum. The weakly spined antennae, rounded elytral apices, and small, rounded pronotal tubercles distinguish it from Periboeum.