Common NameShaded GraniteSeasonalityOn the wing from June to August (McGuffin 1972).IdentificationA medium-sized, light grey geometrid with bold AM and PM lines on the forewing (remnants of these at the hindwing anal angle), and checkered wing fringes. Median band fainter, black discal spots prominent. Very similar to D. setonata, and can be reliably distinguished only by dissection (see McGuffin 1972). Habitat should separate the two most of the time in Alberta, with setonata only in the Crowsnest Pass region, and curvata in the southern prairies.
Scientific NameDigrammia curvataCommon Name
Shaded Granite
Habitat
Arid grasslands and badlands with rabbitbrush (Chrysothamnus).
Seasonality
On the wing from June to August (McGuffin 1972).
Identification
A medium-sized, light grey geometrid with bold AM and PM lines on the forewing (remnants of these at the hindwing anal angle), and checkered wing fringes. Median band fainter, black discal spots prominent. Very…
A medium-sized, light grey geometrid with bold AM and PM lines on the forewing (remnants of these at the hindwing anal angle), and checkered wing fringes. Median band fainter, black discal spots prominent. Very similar to D. setonata, and can be reliably distinguished only by dissection (see McGuffin 1972). Habitat should separate the two most of the time in Alberta, with setonata only in the Crowsnest Pass region, and curvata in the southern prairies.
Life History
Poorly known. McGuffin (1972) describes the immatures in detail. Adults come to light.
Conservation
No reasons for concern.
Diet Info
Larvae feed on rabbitbrush (Chrysothamnus) (McGuffin 1972).
Range
Southern Alberta and BC, south to NV and CO. In Alberta found north to Hanna.
//Citation and Rights Box - in-page ?>
Citation
//Citation and Rights Drawer - slide out ?>
Page Citation for Digrammia curvata
Page Citation
"Species Details - Digrammia curvata, University of Alberta E.H. Strickland Entomological Museum." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/2-4606. Accessed 23 May. 2025.
References
AuthorMcGuffin, W. C.
TitleGuide to the Geometridae of Canada. II. Subfamily Ennominae. 1.
Publication Date1972
Series TitleMemoirs of the Entomological Society of Canada
Volume86
Pages159
Specimen Information
There are 7 specimens of this Species.
//Map Distribution ?>
7 results plotted on map in 2 markers. Note: Only records with latitude and longitude coordinates are plotted on map.