This genus was established by Lord Walsingham in Illustrations of Typical Specimens of Lepidoptera Hetercera in the collection of the British Museum, Part IV., North American Tortricidæ, p. 68 (1879), with emarginana, Wlsm, the only species under it. This variable species was taken in Mendocino and Lake Counties, California, in considerable number (about 40 speciments) in June, 1871, and five varieties were described. His Lordship had the great kindness to give me several examples representing the different varieties.