There has been some discussion recently regarding the separation of the very similar geometers, Orthonama obstipata (The Gem) and Costaconvexa centrostrigaria (Bent-line Carpet). I was at Bo Sullivan's house this past weekend looking at his collection and he has a very nice series of both species, all collected in North Carolina. In the attached image, the left column is Orthonama and the right is Costaconvexa. The top two moths in each column are females and the bottom two are males. This allows a side-by-side comparison illustrating the wing maculation of both sexes of both species. Hope this will be helpful in separating the two in the field. Thanks to Bo for giving me permission to share these specimens with you. Merrill Lynch
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