This is one of our most common and widespread sulphurs. Notice the double cell-spot that is typically found on the hindwing. Unlike the very similar Orange Sulphur, the top (ventral) side of the forewing is lemon-yellow in color and does not have any orange. They occupy a variety of mostly open habitats, including prairies, farmlands, roadsides, and alpine meadows. The larvae feed upon clovers and legumes. Photo by Glenn Marangelo on 7/4/18 in Missoula, MT.