http://www.uglyhedgehog.com/t-300733-1.html#5067312is the link showing the photograph.
According to Dr. Paul Opler who coauthored a book, Moths of Western North America by J.A. Powell and P.A. Opler is pretty sure that its a species of geometrid moth, Sicya macularia. The species is quite variable. It's not reported as early as April though.
rhadams824
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