The modified mouthparts group is perhaps the largest of the four major Hawaiian Drosophila clades, yet has received relatively little taxonomic attention during the past 40 years. This study reviews unplaced species and the ceratostoma, freycinetiae, semifuscata, and setiger subgroups, with descriptions of 22 new species. We hope this work encourages greater study of the biology of this important group.

The modified mouthparts group is perhaps the largest of the four major Hawaiian Drosophila clades, yet has received relatively little taxonomic attention during the past 40 years. This study reviews unplaced species and the ceratostoma, freycinetiae, semifuscata, and setiger subgroups, with descriptions of 22 new species. We hope this work encourages greater study of the biology of this important group.