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Photos of insects and people from the 2022 BugGuide gathering in New Mexico, July 20-24

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Species Digrammia decorata - Decorated Granite - Hodges#6389

Digrammia decorata Digrammia decorata - Hodges #6389 - Digrammia decorata Digrammia decorata Digrammia decorata Camouflaged moth in riparian zone - Digrammia decorata Camouflaged moth in riparian zone - Digrammia decorata Camouflaged moth in riparian zone - Digrammia decorata Digrammia decorata
Show images of: caterpillars · adults · both
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
Synonyms and other taxonomic changes
Semiothisa arubrescens McDunnough 1939
Digrammia arubrescens
Semiothisa decorata
described in 1907 by Grossbeck, who originally placed it in genus Semiothisa
wingspan 22-32 mm, based on several Internet photos
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
Manitoba to British Columbia, south to Colorado, Arizona, and California
prairie badlands (in Alberta), scrublands and riparian areas where foodplant grows
adults fly from March to September in California; May to August in Alberta
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
Digrammia fieldi has a more southern range and the PM line is straighter
Internet References