Key to the species of Pseudocossonus

1. Elytron with a fine basal carina between suture and stria 4; rostrum not widened beyond point of antennal insertion (Japan) ............................... P. brachypusWollaston Elytron without basal carina; rostrum slightly widened just beyond point of antennal insertion......................................................................................................................... 2 2. Dorsum transversely convex or only slightly flattened and/or punctures on sides of pronotum not or barely larger and slightly denser than those on disc of pronotum...... 3 Dorsum obviously flattened and punctures on sides of pronotum clearly larger and denser than those on disc of pronotum.......................................................................... 4