Field Guide Descriptions: Covell (1984); Beadle and Leckie (2012) | Online Photographs: MPG, BugGuide, GBIF, BOLD | Technical Description, Adults: Forbes (1948); Hodges (1971); Tuttle (2007) | Technical Description, Immature Stages: Forbes (1948); Wagner (2005); Tuttle (2007) | |
Adult Markings: One of the smaller Sphinx moths, the dark brown or gray, longitudinally-streaked forewing and yellow-edged hindwing are unmistakable. Sexes are similar. |
Wingspan: 5.8 - 7 cm (Covell, 1984) |
Adult ID Requirements: Unmistakable and widely known. |
Immatures and Development: Larvae are variable in color but late instars have a distinctive eye-like knob located where the caudal horn occurs in other Sphingids. Pupation occurs underground. |
Larvae ID Requirements: Identifiable from good quality photos, especially where associated with known host plants. |