Abstract
Phyllogomphoides biguttatus sp. nov., from western Ecuador, is described based on reared adults of both sexes and larvae collected in slow parts of small forest streams in hilly landscapes. This species belongs to the semicircularis-group of species and is closely related to P. semicircularis (Selys Longchamps) and P. insignatus Donnelly. Phyllogomphoides insignatus probably represents the adelphotaxon of the new species. A differential diagnosis is given to distinguish these closely related species. The new species can be separated from all known Phyllogomphoides Belle by its unique thoracic color pattern with pleural and tergal parts of pterothorax entirely brown to dark brown except for a pair of large yellow drop-shaped antehumeral markings.
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