Hi there and thanks for your informative site
As best as I can see – the moths on my front porch today are Modest Sphinxes – they do not seem to have the distinct battle colors of the Cerisy’s. We live in the country east of Parker Colorado
Your photo is breathtakingly beautiful. This is a species closely related to the Modest Sphinx. It is the Big Poplar Sphinx, Pachysphinx occidentalis, the pale color form. Bill Oehlke’s wonderful website has some nice images of this beautiful moth. We have also heard it called the Western Poplar Sphinx.