The Cabbage White butterfly can be distinguished by the white color with small black dots on its wings. They are distinguished from the smaller size and lack of the black band at the tip of their forewings. The caterpillar of this species is seen as a pest for commercial agriculture. Often referred to as the "imported cabbageworm" they are a serious pest to cabbage and other mustard family crops.
Fun Fact The Cabbage White was accidentally introduced to North America in the late 1800's. Since then it has spread from coast to coast.