It is easy to distinguish between the male and female cabbage white by the number of spots on the forewing. If the butterfly has one spot, such as the first picture, then it is male but if it has two on the forewing, as shown above, then it is a female..
The eastern-tailed blue is another small butterfly that can be found through out most of the eastern part of North America, from the eastern coast of Canada and The US west to North Dakota, Colorado and central Texas, as well as parts of Mexico and the West Coast.
The eastern-tailed blue is a member of the Gossamer-wing family of butterflies and can be identified by the long hair like tail on the hindwing for which it gets its name. The only other blue butterfly with a tail is its cousin the western-tailed blue which is a bit larger and lacks orange spots at the base of the hind wing.
Eastern-tailed blue butterflies have a number of different types of host plants. Since their proboscis, or feeding tube, is not very long they look for short tubed flowers or ones that are open. Favorites include white clover, white sweet clover, shepherd's needle, wild strawberry, flea-bane. asters, winter cress and others. In the picture above two eastern tail blue are using their proboscis to drink nectar from a birds-foot trefoil flower.