Dual Bipartite Q-polynomial Distance-regular Graphs

We classify the dual bipartite Q-polynomial distance-regular graphs of diameterd≥5which are not bipartite. Results of Curtin and Nomura give a classification of the dual bipartite Q-polynomial distance-regular graphs of diameterd ≥6which are bipartite. This completes a classification of the dual bipartite Q-polynomial distance-regular graphs of diameterd≥6.