Canadian Nymphomyiidae (Diptera)

Abstract

A new genus and species, Oreadomyia albertae, is described from the mountains of western Alberta. This differs in several important adult characters from the three previously known genera and species of Nymphomyiidae, particularly in the possession of mouthparts (which are rather unlike those of other Diptera), in the form of the compound eyes, and in the virtually apterous condition. It is placed in a new subfamily, Oreadomyiinae. Further records of Palaeodipteron walkeri Ide are given for New Brunswick. These include examples of the previously unknown, fully alate adults. The systematic position of the Nymphomyioidea is briefly discussed. The group is retained in a separate suborder, Archaeodiptera. An appendix gives a list of arthropods trapped at the same site as O. albertae.