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Species Digrammia sexpunctata - Six-spotted Digrammia - Hodges#6387.1

Digrammia sexpunctata
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 sexpunctata (Six-spotted Digrammia - Hodges#6387.1)
Hodges Number
Forewings mostly plain gray with black marks on the costa at the locations of the AM, median, and PM lines. The PM line is often bold, black, and continuous about half-way down the FW, typically with at least an additional black smudge outside the PM line across from the FW cell.
Known mainly from the Great Basin ranges.(1) Ferguson examined specimens from Colorado, Idaho, Nevada, Oregon, Utah, and Washington. An MPG record mapped in central Texas was based on a misidentification.
In mountainous areas, the species occurs at middle elevations (7,000 - 8,000 ft).(1)
Flight period May to early August with peak in early to mid-July.(1)
The species has been reared from larvae on Purshia tridentata (Antelope bitterbrush).
Ferguson(1) states that the species is so close to Digrammia ubiquitata that some specimens may needed genitalic examination to be separated. They occur over much of the same Great Basin range. The bold PM black line may be less continuous across the FW in ubiquitata (suggested in MPG images).
Internet References
Works Cited
1.The Moths of America North of Mexico, Fascicle 17.2, Geometroidea, Geometridae, Ennominae.
Douglas C. Ferguson . 2008. The Wedge Entomological Research Foundation.