Hemiargus isola

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Reakirt's blue
Reakirt's blue (Echinargus isola) ventral.jpg
Reakirt's Blue (Hemiargus isola), ventral.jpg
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Lycaenidae
Genus: Hemiargus
Species: H. isola
Binomial name
Hemiargus isola
(Reakirt, 1866)
  • Lycaena isola Reakirt, [1867]
  • Echinargus isola
  • Lycaena nyagora Boisduval, 1870
  • Lampides zachaeina Butler & Druce, 1872
  • Lycaena alce Edwards, 1871

Hemiargus isola, the Reakirt's blue, is a butterfly of the Lycaenidae family. It is found in Central America and the extreme southern U.S. Hemiargus isola migrates regularly throughout most of the U.S. almost to the Canada–United States border, and very rarely into the southern prairies.[1]

The wingspan is 16–23 mm. Adults are on wing from June to October in the north and year round in south.[1]

The larva feed on Fabaceae, particularly mesquites (Prosopis species).[1]


  • Hemiargus isola isola
  • Hemiargus isola alce (Edwards, 1871) (Colorado)


  1. ^ a b c Reakirt's Blue, Butterflies of Canada