You can tell if a polyphemus moth is male or female by carefully looking at the comb-like antennae to see if the antennae are large which is male, or small which is female.

Out moth’s antennae are quite small so I determined that it was a female. See photo below.

 

Photo by Jessica Milne

Here is an example of a male polyphemus moth:

https://commons.wikimedia.org/wiki/File:Polyphemus_Moth_(Antheraea_polyphemus),_Male_-_Guelph,_Ontario_01.jpg

Website information from: Featured Creatures

http://entnemdept.ufl.edu/creatures/MISC/MOTHS/polyphemus_moth.htm#dist