Identification
Field Guide Descriptions: Online Resources: MPG , BugGuide , iNaturalist , Google , BAMONA , GBIF , BOLD Technical Description, Adults: Forbes (1948); Ferguson (2008)Technical Description, Immature Stages: Ferguson (2008)
Adult Markings: A medium-sized Geometrid similar in size, wing shape, and pattern to Macaria species, with which it was previously combined under the genus Semiothisa. The ground color of abydata is pale, yellowish-brown, usually shaded with dark brown in the postmedial area. The forewings are crossed by three dark brown, fairly diffuse or obscure transverse lines; the postmedian is typically marked with a distinctive chain of dark points. Dark discal dots are also usually present on all four wings, distinguishing this species from Macaria and Digrammia species, but the dark costal and subterminal dark spots characteristic of Macaria are absent. Trigrammia quadrinotaria, which also possesses dark spots on all four wings, is much paler gray and lacks the dark shading found in the subterminal area of P. abydata (see Ferguson, 2008, for details).
Adult Structural Features: Antennae of males are somewhat serrate (Forbes, 1948). Foveae are absent and the hind tibiae are swollen (Ferguson, 2008).
Adult ID Requirements: Identifiable from good quality photos of unworn specimens.
Immatures and Development: Described and illustrated in Ferguson (2008)
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