Abstract The first Eodichromatidae (Odonata, Cephalozygoptera) specimens from the Ypresian Allenby Formation near Princeton, British Columbia, Canada, are described. They belong to the genus Labandeiraia Petrulevičius et al . (Eodichromatinae) based on the distinctive distal undulate curvature of the long veins and numerous intercalary veins, as seen in L. americaborealis Petrulevičius et al . from the coeval Green River Formation of Colorado, United States of America. Labandeiraia burlingameae n. sp. is described based on an almost complete hyaline forewing. It is distinct from L. americaborealis by its colouration and number of postnodal crossveins. A darkly infuscate forewing preserved in close proximity is similar but lacks its basal portion and has poorly preserved crossveins. Its preserved portions agree with both L. burlingameae and L. americaborealis . If this wing belongs to L. burlingameae , its colour difference might result from sexual dimorphism or polyphenism, which are not known in any eodichromatid. If the wing belongs to L. americaborealis , it has a forewing/hind wing colour difference, also not known in any Labandeiraia species, and would be its first known forewing. The specimen might also belong to a third, closely related, undescribed species. These possibilities cannot be distinguished, and we treat the species as Labandeiraia sp. A.
Archibald et al. (2026) studied this question.