A new species of Celastrina from the northwestern United States and southwestern Canada with a lectotype designation of Lycaena pseudargiolus var. nigrescens Fletcher (Lycaenidae: Polyommatinae)

This dataset contains the digitized treatments in Plazi based on the original journal article LaBar, Caitlin C., Pelham, Jonathan P., Kondla, Norbert G. (2022): A new species of Celastrina from the northwestern United States and southwestern Canada with a lectotype designation of Lycaena pseudargiolus var. nigrescens Fletcher (Lycaenidae: Polyommatinae). The Taxonomic Report of the International Lepidoptera Survey 10 (3): 1-25, DOI: 10.5281/zenodo.16420362 ABSTRACT.

A new western azure species, Celastrina asheri, is described from the northwestern United States and southwestern Canada. A lectotype is designated for Lycaena pseudargiolus var. nigrescens Fletcher, 1903 to secure the identity of that name. C. asheri broadly overlaps with the northeastern range of C. echo (W. H. Edwards, 1864) but is usually very distinct from that species.