It can be difficult distinguishing between an Orange Sulphur (Colias eurytheme) and a Clouded Sulphur (Colias philodice), and this photo is a good example. One expert identified it as a Clouded Sulphur and a different expert identified it as an Orange Sulphur. I already knew it was a Sulphur and I still don't know which one!
Retired economics professor (“dismal scientist”). Married 40+ years to the love of my life; we have two grown daughters, both married, two granddaughters and a...