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Photo#17550
Big Poplar Sphinx - Pachysphinx occidentalis

Big Poplar Sphinx - Pachysphinx occidentalis
Montrose, Montrose County, Colorado, USA
May 16, 2005
Size: 5"
Red spots visible on fully extended wings. Found about 1 hour before dusk in residential area.

7829 - Big Poplar Sphinx Moth - Pachysphinx occidentalis
You can read some details about it on this USGS Webpage. Your specimen is considered to be the "dark" form.

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