Bob,

Awesome pictures.

To further "cloud" the issue, where both Colias eurytheme and C. philodice occur in the same area they do interbreed freely.

I'd tend to go with Colias philodice on these pictures. Late season C. eurytheme tend to have much darker and heavier apical and marginal scaling even in the albinic form females.

Larry

I have no idea on the butterfly, but those photos are stunning!

Karen

Thanks for the assistance, Larry. Sure is nice to have truly knowledgeable people to call on!

Tepelus, your words are very much appreciated!

Bob