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Species Page - Chlosyne acastus
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scientific name    Chlosyne acastus    

common name     Sagebrush Checkerspot

habitat
Prairie badlands and grasslands.

seasonality
One flight per year, peaking in late June to late July.

identification
The orange and black-brown patterned upperside, and prominent creamy-white spots of the hindwing underside, are characteristic of three of our Chlosyne, namely acastus, palla, and damoetas. Acastus has more extensive whitish underside markings and a lighter orange upperside than palla and damoetas. The habitat and range of acastus does not overalp with the other similar Chlosyne species in Alberta. Alberta populations are subspecies acastus.

life history
Very little life history data is available for Canadian populations. The larvae are black and spiny, and feed in groups until reaching the third instar (Scott 1986). The Sagebrush Checkerspot has two and occasionally three broods in the southwest US (Scott 1986). The unusually long flight period reported for Alberta (8 May to 5 September, Bird et al. 1995) and Saskatchewan (28 May to 7 August, Hooper 1973) are indicative of an occasional or partial second brood.

conservation
Ranked "Sensitive" in Alberta; dependent primarily on prairie badlands habitat.

diet info
The only reported larval host in Canada is an aster, Machaerantha canescens (Bird et al. 1995), which closely matches the prairie badlands distribution of acastus (Moss 1992). Adults nectar at thistles (Bird et al. 1995).

range
Southern Alberta and Saskatchewan south to New Mexico and California (Scott 1986). In Alberta, most common along the Red Deer River badlands, north to Dry Island Buffalo Jump (Bird et al. 1995).

quick link
http://entomology.museums.ualberta.ca/searching_species_details.php?s=2812



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References (5)
Specimen Info
There are 30 specimens of this species in the online database
Map Distribution
Adult Seasonal Distributioncreate a collection histogram with specimens
Specimen List (30)

 

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