Insects by Picture
Butterflies and Moths by Picture
Lepidoptera Taxonomy
Udea rubigalis - Wikipedia
Udea rubigalis - BugGuide
I spotted this celery leaftier twice in April 2014, once on a star jasmine leaf, as shown below, and once on an old violet woodsorrel leaf. According to wikipedia, celery leaftier larvae eat beans, beets, celery, and spinach.
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