Clouded Sulphur
Colias philodice

f25 @ 1/320s, ISO:2000, Nikon D3S w 105mm macro

"Colias philodice, Wikipedia, the free encyclopedia. The common sulphur or clouded sulphur, is a North American butterfly in the family Pieridae, subfamily Coliadinae.This butterfly may be encountered in fields, lawns, alfalfa or clover fields, meadows, and roadsides. Swarms of these butterflies will congregate at mud puddles. They range over most of North America with the exception of Labrador, Nunavut, and northern Quebec. They migrate every year. Clouded sulphurs nectar at flowers such as milkweed (Asclepias species), butterfly bush (Buddleja species), coneflower (Dracopis, Echinacea, and Rudbeckia), alfalfa (Medicago sativa), dandelion (Taraxacum species), clover (Trifolium species), and tall verbena (Verbena bonariensis) and many more.
Francis A. Crane Wildlife Management Area, east Falmouth, Massachusetts