The
wingspan is 16–17 mm. Adults are on wing from mid April to August in one generation per year. They feed on the flower nectar of various plants, but mostly Eriogonum species.
Subspecies
E. b. battoides (Behr, 1867) (California)
E. b. comstocki (Shields, 1975)
E. b. centralis (Barnes & McDunnough, 1917) (southern Colorado to northern New Mexico)
E. b. argocyanea (Pratt and J. Emmel, 1998)
E. b. fusimaculata (Pratt and J. Emmel, 1998)
E. b. mazourka (Pratt and J. Emmel, 1998)
E. b. panamintensis (Pratt and J. Emmel, 1998)
E. b. vernalis (Pratt and J. Emmel, 1998)
Invalid Subspecies
E. b. bernardino (Barnes & McDunnough, 1916) – Bernardino Square-spotted Blue
E. b. centralis (Barnes & McDunnough, 1917)
E. b. glaucon (Edwards, 1871) (British Columbia to northeastern California and southern Idaho)
E. b. intermedia (Barnes & McDunnough, 1917)
E. b. baueri (Shields, 1975)
E. b. ellisi (Shields, 1975)
The
El Segundo blue (Euphilotes allyni) was originally thought to be a subspecies, but recent authorities consider it its own species.[5][6]
References
^Euphilotes at Markku Savela's website on Lepidoptera
^Lepidoptera of North America 6, Butterflies of Oregon, Their Taxonomy Distribution and Biology, Andrew J. Warren
^Davenport, K. 2018. Lepidoptera of North America 15. Butterflies of southern California in 2018: updating Emmel and Emmel's 1973 Butterflies of southern California. Contributions of the C.P. Gillette Museum of Arthropod Diversity Colorado State University, Fort Collins, Colorado. 175 pp.
^Rubinoff, D., T. Longcore, J.R. Dupuis, and K.H. Osborne. 2021. Genomic data support the elevation of the federally listed El Segundo Blue (Euphilotes bernardino/battoides allyni) to species status. Journal of the Lepidopterists' Society 75(2): 161-164.