The Twin-spotted Sphinx (Smerinthus jamaicensis) is a moth of the Sphingidae family. It is widely distributed across North America and is found everywhere except in the southern half of western California. It has been taken as far north as the Yukon.
It has a wingspan of 13⁄4–31⁄4 inches (4.5–8.3 cm), with the outer margins of the forewings unevenly scalloped, but with the coastal margin of hindwings being almost straight. Males have gray with black and white markings on their forewings, while females are yellowish brown with dark brown and white markings.
Both sexes have red hindwings with a pale yellow border. Sometimes a blue patch may appear as a single eyespot or it may be divided by black bands, creating two or three eyespots. Adult moths are nocturnal, but seem to prefer the earlier part hours of the night.
- Fullard, James H. & Napoleone, Nadia (2001): Diel flight periodicity and the evolution of auditory defences in the Macrolepidoptera. Animal Behaviour 62(2): 349–368. doi:10.1006/anbe.2001.1753 PDF fulltext
- Twin-spotted sphinx Butterflies and Moths of North America
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