Reakirt’s Blue

Hemiargus isola

The Reakirt’s Blue is mainly a resident of the southwestern United States and Mexico, but does stray north most years and occasionally makes it as far as Wisconsin. In Ebner’s Butterflies of Wisconsin, he notes that it was reported only twice before 1970. It has now been reported from 12 counties, and has been reported from five counties since 2000.

Weekly sightings for Reakirt’s Blue

Identifying characteristics

Above, the male is mostly blue with a thin black margin and usually shows one or two dark spots near the trailing edge. The female is much darker but with some blue usually showing nearer the body. Below, the sexes are essentially the same, with a light gray background and a prominent row of black spots on the forewing and with a large black spot and several smaller black spots on the margin of the hindwing.

Similar species

In Wisconsin this species should not be confused with any other Blues.


Open, grassland areas, including prairie and disturbed areas.


The Reakirt’s Blue is many-brooded in its normal range. It may occasionally find its way to Wisconsin during the summer months and start temporary colonies that cannot survive the winter.


This species is a stray in Wisconsin and is rarely abundant.


Map showing sighting locations for Reakirt's Blue
Map key
Reakirt's Blue

Mating pair, photo © 2002 david hanson

Bentsen S.P., Mission, TX. April 12, 2002.

Reakirt's Blue

Photo © 2002 david hanson

Valley Nature Center, Weslaco, TX. February 27, 2002.