Pterospoda nigrescens (Hulst), a synonym of Ixala klotsi Sperry (Lepidoptera, Geometridae, Ennominae).
Comparison of the types of Ixala klotsi (Sperry) and Pterospoda nigrescens (Hulst) shows that they are the same species, with Ixala klotsi a synonym of Pterospoda nigrescens. A lectotype of Selidosema nigrescens is designated, and the types of Selidosema nigrescens and Ixala klotsi are illustrated. Male and female habitus and genitalia of Pterospoda nigrescens are illustrated.
5405 Bill Nye Ave., R.R. 3, Laramie, WY 82070, USA. Research Associate: McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL; C. P. Gillette Museum of Arthropod Diversity, Colorado State University, Ft. Collins, CO; Florida State Collection of Arthropods, Gainesville, FL.
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