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Species Digrammia decorata - Decorated Granite - Hodges#6389

Digrammia decorata Digrammia decorata - Hodges #6389 - Digrammia decorata Digrammia decorata Digrammia decorata - Hodges #6389 - Digrammia decorata Digrammia decorata moth ID - Digrammia decorata Moth - Dorsal view - Digrammia decorata
Show images of: caterpillars · adults · both
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Lepidoptera (Butterflies and Moths)
Superfamily Geometroidea (Geometrid and Swallowtail Moths)
Family Geometridae (Geometrid Moths)
Subfamily Ennominae
Tribe Macariini
Genus Digrammia
Species decorata (Decorated Granite - Hodges#6389)
Hodges Number
6389
Synonyms and other taxonomic changes
Semiothisa arubrescens McDunnough 1939
Digrammia arubrescens
Semiothisa decorata
two additional synonyms listed at All-Leps
described in 1907 by Grossbeck, who originally placed it in genus Semiothisa
Size
wingspan 22-32 mm, based on several Internet photos
Identification
Adult: forewing medium gray or brownish-gray with black AM and PM lines, and distinct dark discal spot; lower portion of AM line bold/conspicuous but upper portion faint/absent; PM line strongly curved, S-shaped, interrupted by short space near costa, and edged distally by diffuse band of grayish=brown shading; hindwing PM line slightly concave and visible only in lower half (does not extend across wing)
In some specimens (such as these 2 labelled arubrescens and Jim Vargo's arubrescens photo at MPG) lower portion of PM line is almost straight, not S-shaped. Perhaps "arubrescens" is a recognizable form (?)
Specimen identified by DNA analysis:


Larva: body green with paler lines and yellow lateral stripe
Range
Manitoba to British Columbia, south to Colorado, Arizona, and California
Habitat
prairie badlands (in Alberta), scrublands and riparian areas where foodplant grows
Season
adults fly from March to September in California; May to August in Alberta
Food
larvae feed on leaves of willow (Salix spp.)
Life Cycle
probably two generations per year
See Also
Signate Digrammia (Digrammia s-signata) is smaller, forewing is paler, more yellowish, AM line is faint or absent, discal spot is smaller or absent, hindwing PM line is almost straight and completely crosses wing
Mesquite Looper (D. cyda) forewing has extensive dark transverse streaks, PM line is interrupted by yellowish-orange blob near costa, AM and median lines are blackish and conspicuous
D. subminiata forewing PM line is straighter, forming a very shallow S-shape, and is usually thicker than in decorata
Internet References
pinned adult images and photos of related species by Jim Vargo (Moth Photographers Group)
7 pinned adult images and collection site map (All-Leps)
species account including common name reference, habitat, flight season, description, foodplant, distribution (Strickland Entomological Museum, U. of Alberta)
pinned adult images [as synonym arubrescens] (Bruce Walsh, Moths of Southeastern Arizona)
presence in Colorado; list [as synonym Semiothisa decorata] (Paul Opler, Moths of Rocky Mountain National Park, Colorado)
presence in California; list of 9 specimen records [as synonym arubrescens] with dates and locations (U. of California at Berkeley)
distribution in Canada; list of provinces (CBIF)