Debus adusticollis (Motschulsky) comb. n.

Xyleborus adusticollis Motschulsky, 1863

Xyleborus vestitus (Schedl, 1931): Wood, 1989

Specimens examined. Brunei (4, R. A. Beaver det., BMNH), Malaysia, Sabah, Danum Valley (7, R.A. Beaver det., BMNH).

Comments. Placement in Debus clade was confirmed by molecular phylogenetic analysis (72% and 73% posterior probability, Cognato et al., 2011). It is a very long species, with an elongated pronotum, deeply excavated declivity, and a rounded apex.