Excerpt from The Lepidoptera of the British Islands, Vol. 7: A Descriptive Account of the Families, Genera, and Species Indigenous to Great Britain and Ireland, Their Preparatory States, Habits, and Localities, Heterocera Geometrina

Antennæ simple, palpi minute, head and thorax rather rough, the latter narrow, abdomen long and very slender, fore wings broad, but elongated and pointed, hind wings large and rounded behind.

We have but one species.

1. P. petraria, Hub. - Expanse 1 1/4 to 13/8 inch. Fore wings broad, pointed, pale reddish-brown, dusted with darker, the two transverse lines brown, oblique, parallel, the second edged with white, discal spot a black dot. Hind wings large, white with a partial transverse brown bar. Abdomen long and slender.

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