Ambrosiophilus sexdentatus (Eggers, 1940) comb. n.

Previous genus: Streptocranus

Compared to holotype in USNM

Diagnosis: Antenna type 4–5. Posteriorly prolonged pronotum. Prolonged elytra, declivity impressed along suture, surrounded by an elevated sulcus from elevated interstriae 2 and 3. The sulcus reaches almost to the bases of elytra, and is armed with conspicuous teeth. The species is variable in size.

Length: 2.8–3.2 mm.

Discussion. The species was described as Xyleborus by Eggers (1940), then transferred to Ambrosiodmus (Wood & Bright, 1992), followed by a transfer to Streptocranus (Hulcr et al., 2007) . Its placement into Ambrosiophilus herein is based on a survey of more species and characters than by Hulcr et al. (2007), and has 100% posterior probability in a multi-gene Bayesian phylogenetic analysis (Cognato et al., unpublished).The holotype from Java has the same arrangement of teeth and striae as specimens from New Guinea. It is slightly shorter (5–10%), the declivital excavation is a little shallower and enclosed by less conspicuous wall. Ambrosiodmus optatus (which may eventually be transferred to Ambrosiophilus) from Australia closely resembles A. sexdentatus, but differs in the shallowly excavated declivity. Both A. sexdentatus and A. optatus have mostly orange to light brown color.

Biology: Recorded as an associate of Beaverium sundaensis (J.H., unpubl.) but the ecological significance of the record is uncertain.

Examined material: Indonesia, Java, Batoerrad, (holotype, USNM); PNG: Madang Prov. (8), Oro Prov. (2), J. Hulcr 2002–2006.