|scientific name Digrammia curvata |
common name Shaded Granite
Arid grasslands and badlands with rabbitbrush (Chrysothamnus).
On the wing from June to August (McGuffin 1972).
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.
Poorly known. McGuffin (1972) describes the immatures in detail. Adults come to light.
No reasons for concern.
Larvae feed on rabbitbrush (Chrysothamnus) (McGuffin 1972).
Southern Alberta and BC, south to NV and CO. In Alberta found north to Hanna.
Comments are published according to our submission guidelines. The EH Strickland Entomological Museum does not necessarily endorse the views expressed.