2 Giant Silkmoths: Prometheus Moth and Polyphemus Moth

Silk worm moths
Location: Sherman, CT
May 30, 2011 2:01 pm
We just found both of these in our yard in CT. Both silkworm moths, we think a polyphemus and a prometheus–any thoughts. Both about 5” wing span.
Signature: Dee Ratterree

Female Prometheus Moth

Hi Dee,
We agree with both of your identifications.  The Prometheus Moth is a female.  The sexually dimorphic males are smaller and have very dark coloration.  The Polyphemus Moth is also a female.  The antennae of the male are much more developed.

Polyphemus Moth

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