Lepidoptera Survey


Date of this Version


Document Type



Taxonomic Report of the International Lepidoptera Survey (April 28, 2022) 10(4): 1-24

Also available at https://lepsurvey.carolinanature.com/ttr/ttr-10-3.pdf

Also available at the Internet Archive, the Biodiversity Heritage Library, Zobodat, and Zenodo

ZooBank registration: https://zoobank.org/References/F7F2600A-6690-4277-AFE7-F8DC85E1178F


Copyright 2022, the International Lepidoptera Survey. Open access material

License: Creative Commons Attribution-ShareAlike-NonCommercial 4.0 International (CC BY-SA-NC 4.0 International)


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. C. lucia (W. Kirby, 1837) is narrowly sympatric with C. asheri in British Columbia, the southwest corner of Alberta and along the Rocky Mountains in Montana. As far as is known, C. asheri uses only red osier dogwood (Cornus sericea) and possibly oceanspray (Holodiscus discolor) as larval foodplants, while C. echo and C. lucia use a wide variety of larval foodplants. A lack of past research and confusion as a “form” of C. echo obscured the identity of C. asheri.