Species Details
Digrammia curvata
University of Alberta E.H. Strickland Entomological Museum Read more about this collection »
Common NameShaded Granite
SeasonalityOn 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 Name
Digrammia curvata
Common 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
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
Author
McGuffin, W. C.
Title
Guide to the Geometridae of Canada. II. Subfamily Ennominae. 1.
Publication Date
1972
Series Title
Memoirs of the Entomological Society of Canada
Volume
86
Pages
159
Specimen Information
There are 7 specimens of this Species.
UASM41554 - Digrammia curvata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Sandy Point Recreation Area
Collected ByAnweiler, G. G.; Schmidt, B. C.
Date Collected2000-05-19
UASM41555 - Digrammia curvata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Sandy Point Recreation Area
Collected ByAnweiler, G. G.; Schmidt, B. C.
Date Collected2000-05-19
UASM41556 - Digrammia curvata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Sandy Point Recreation Area
Collected ByAnweiler, G. G.; Schmidt, B. C.
Date Collected2000-05-19
UASM41557 - Digrammia curvata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Sandy Point Recreation Area
Collected ByAnweiler, G. G.; Schmidt, B. C.
Date Collected2000-05-19
UASM41578 - Digrammia curvata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Lost River
Collected ByAnweiler, G. G.; Troubridge, J.
Date Collected2000-06-26/2000-06-27
UASM41579 - Digrammia curvata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Lost River
Collected ByAnweiler, G. G.; Troubridge, J.
Date Collected2000-06-26/2000-06-27
UASM41580 - Digrammia curvata
University of Alberta E.H. Strickland Entomological Museum
Place CollectedCanada: Alberta, Lost River
Collected ByPohl, G.
Date Collected1996-06-14