I have photographed-and-posted many butterflies here (this is #149 …, he wrote sheepishly), but this is one I haven't seen in the nearly 5 years since my first posted butterfly.
Pretty sure this is a Falcate orangetip (“Anthocharis midea”). Males that have orange tips on their forewings, but females do not. For a male, see Carolyn's post from a couple weeks ago, http://365project.org/cjwhite/my-365-project/2016-03-30
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...