EDI Species of the Week

Acmon Blue (Plebejus acmon)

This is one of the more common blue butterflies in our area as it occurs in a variety of open areas from weedy urban lots to the desert. It lays its eggs on deerweed, buckwheat, and locoweed, and can often be seen taking nectar from buckwheat flowers. The caterpillar has glands that exude a sugary substance, which is collected by some ant species. In return, the ants protect the caterpillar from predators such as wasps. These caterpillars are said to be “ant-attended”. The first photo is of a female, and the last photo is of a male. Males are a much more vivid blue, while the females tend to be browner.