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Genus Rheumaptera

1224 Rheumaptera undulata - Scallop Shell Moth 7291 - Rheumaptera - female Rheumaptera undulata Cherry Scallop Shell - Hodges#7292 - Rheumaptera prunivorata undulata / prunivorata species pair - Rheumaptera Leptarctia californiae? - Rheumaptera Geometridae, Cherry Scallop Shell, larvae - Rheumaptera prunivorata Rheumaptera undulata ? - Rheumaptera Moth to porch light  - Rheumaptera
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 Larentiinae
Tribe Hydriomenini
Genus Rheumaptera
Synonyms and other taxonomic changes
prunivorata and undulata were formerly placed in genus Hydria
Numbers
4 species in North America listed at All-Leps: hastata, prunivorata, subhastata, undulata
Size
wingspan 26-32, based on several Internet photos
Identification
Of the 4 species in this genus, 2 are mostly black with white bands, and 2 are medium brown with many zigzag lines running across the wings. The two groups don't look at all similar, and one would never guess that both groups belonged to the same genus (see sample images of both in Internet References section below).
Range
all of Canada and most of United States
See Also
The variation in pattern among individuals of R. hastata and R. subhastata is much greater than the variation between the two species. In these 7 photos; the first 2 are hastata, and the last 5 are subhastata. Could you tell which was which if the specimens weren't labelled? Since these two species have virtually identical geographic ranges, examination of genitalia is the only reliable way to separate the two.
Internet References
pinned adult images of 4 species (CBIF)
pinned adult images of 4 species, with collection site maps for each (All-Leps)
distribution in Canada list of provinces and territories (CBIF)